Opentimelineio

This release introduces the ImageSequenceReference schema to OTIO. It adds support for media references that point at sets of files on disk, for example, the rendered EXR frames for a shot. This work was contributed by apetrynet and reinecke. It includes RV adapter support.

Additionally, we're starting a restructure of some of the core math libraries built around a more consistent mathematical framework. The first of these changes is shifting to predicates based on Allen's Interval Algebra [https://en.wikipedia.org/wiki/Allen%27s_interval_algebra] .

Big things:
- ImageSequenceReference (apetrynet and reinecke) main: 602 722 w/ 783 751
- Allen Interval Algebra predicates (KarthikRIyer) 697
- AAF Reader metadata support 739
- Post adapter write hook added (apetrynet) 730
- RV native plugin (so that you can read OTIO files from inside RV rather than convert via an adapter to .rvsession files) avrata and apetrynet 637

Small things:
- Reverse and dissolve fixes, Wipe transition support was added to the CMX EDL adapter 763 757 687
- Fixing up some bugs and algorithms in `rationalTime.cpp` 755 721 692 (reinecke and KarthikRIyer)
- Tox changed and our setup.cfg was altered to conform with the new standard
- otioview enhancement: double click to see full track name (KarthikRIyer) 690
- conform.py example now prints support file suffixes (thebigsasha) 676
- FCP7 adapter bug fixes 674
- xges adapter markers and effects support (hwilkes-igalia) 609
- Fix bugs in the kdenlive adapter (vpinon) 714
- bumped pin of PyAAF2 version to 1.4.0 738
- bug fixes in Markers 740 and 592 (elabrosseRodeofx)

Project related things:
- added issue templates to the github repo 768
- cleaned up developer quickstart documentation 717
- documentation was broken on read the docs, this was fixed 715

Includes PR 669, which fixes issues in the cmake build system reported on windows machines. As always, please let us know if you see any further issues and alert us! Thanks!

This is the first release with the C++ core. Please test the new build system and make sure it works for your needs. If you run into issues, pin to 0.11.0 (the last pure python release) and let us know so that we can address them.

The adapters remain in python, but the core library and algorithms are implemented in C++. For more information you can see this pr:
https://github.com/PixarAnimationStudios/OpenTimelineIO/pull/540

Big Changes:
- C++ Core: the core of opentimelineio is now pybind11-wrapped C++. (see above)
- otiopluginfo command was added for printing information about plugins visible to otio: https://github.com/PixarAnimationStudios/OpenTimelineIO/pull/586
- Kdenlive adapter included in contrib (thanks vpinon) https://github.com/PixarAnimationStudios/OpenTimelineIO/pull/618
- Also includes preliminary swift bindings

Small Changes:
- Tweaks to the repo in anticipation of the move to being hosted by the Academy Software Foundation
- hook function arguments are passable to all commandline scripts (mikekoetter) https://github.com/PixarAnimationStudios/OpenTimelineIO/pull/651
- Documention for the C++ core, debugging and building
- local manifests are loaded so that they override the internal manifests for plugins (JoshBurnell) https://github.com/PixarAnimationStudios/OpenTimelineIO/pull/591
- Lots of upgrades for the AAF adapter (JoshBurnell)
- SchemaDefs now have a repr method https://github.com/PixarAnimationStudios/OpenTimelineIO/pull/566
- CMX EDL Adapter supports multiple locaters per clip now (elabrosseRodeofx) https://github.com/PixarAnimationStudios/OpenTimelineIO/pull/664

Lots of other small fixes and changes. Thank you to all of the community contributors!

This release is a final checkpoint before we land the C++ branch (cxx) into the master branch. We found there were a number of other small changes that needed to be made before the CXX and Master branches were ready to be merged, so we needed to do one more release before we did that.

Big Changes:
- The CXX branch is now up to date with master and will be landed shortly after we make this release. (528)
- In keeping with the VFX platform, we've dropped support for python 3.5 and added support for python 3.7 in our unit test and CI system. (526)

Small Changes:
- AAF bugfixes by freesonluxo (517, 518, 512, 493)
- Autogenerated schema documentation + unit test for detecting schema changes (521)
- FCP XML bugfixes by reinecke (494)

Big thanks go to andrewmoore-nz and thecargocultnz for all the _very_ detailed bug reports and repro cases, they are very helpful for improving OTIO robustness!

We have a port to C++ that you can preview on the cxx branch which we will soon land into master. There are also some schema changes we'd like to make, which we'll be working on and presenting to the community after we land the C++ port. If you'd like to read about how that will work:
https://opentimelineio.readthedocs.io/en/latest/tutorials/wrapping-otio.html

Breaking Change:
- In anticipation of the C++ port (see the cxx branch: https://github.com/PixarAnimationStudios/OpenTimelineIO/tree/cxx) a number of changes were made to make the python API behave like the C++ one
- 372 types in Opentime are now immutable
- This led to other enhancements that shouldn't be as noticeable to developers:
- 477 `Timeline.global_start_time` had a default value of 0, 24 and was not being serialized. Now it defaults to `None` and is correctly serializead/deserialized
- 377 JSON serializer adapter arguments tweaked
- 364 Using `weakref` to point at parents
- 400 the `__copy__` method has been removed

Big Changes:
- Lots of upgrades and new features for the AAF Adapter, including:
- 432, 460, 461, 454 Writing AAFs! (thanks freesonluxo and shahbazk8194!)
- Thanks to andrewmoore-nz and thecargocultnz for all the great test data, we always appreciate that!
- AAF unit tests now work on our continuous build system
- Lots of robustness and correctness upgrades to the AAF Reader (jchen9, flavienliger, others)
- 396 Adapter was ported from pyaaf1 to pyaaf2 (freesonluxo and shahbazk8194)
- ...and thanks to markreidvfx for bug fixes in upstream pyaaf2!
- FCPX adapter:
- 425 markers and detached audio (eric-with-a-c)
- OTIOView upgrades:
- 451 playhead/ruler for inspecting frame numbers (tdervieux)
- 457 upgrade to the effect widget legibility (tdervieux)
- 467 key navigation filter menu (tdervieux)
- 449 frame all function (tdervieux)
- 378 fixing support for nested tracks (avrata)
- 422 Significant performance boost for large files
- Optimization:
- speed improvement on `each_child` that reduced a 691s operation on a full-film OTIO file to 0.8s.
- 497, 488 Enhancements to Dropframe support in Opentime (apetrynet and reinecke)
- 450 Hookscript plugins now have arguments passed in (mikekoetter)

New adapters:
- 412 GStreamer Editing Services XML adapter (thiblahute)

Small Changes:
- arguments for the commandline tools are now more consistent and richer
- media linker arguments are now passed in
- 434, 392 upgrades for the EDL adapter (apetrynet, mikekoetter)
- 437 there was a slice membership bug that got fixed
- 426, 363 For audio-only tracks, the rv adapter will insert a blank movieproc so only sound is loaded from a source (avrata, apetrynet)
- better unicode string support
- 462 ALE adapter ugprades (mikekoetter)
- 403 Fix a bug in the hook/manifest system (timlehr)

And more! Thanks to everyone for this big release!

Big Changes:
- 309 FCP X XML adapter (thanks eric-with-a-c)
- New plugins:
- 351 HookScripts: let you run code in between steps in the OTIO execution flow
- 342 SchemaDefs: add your own proprietary schemas to OTIO (for example, for a custom metadata class specific to your studio) (peachey)
- 342 UnknownSchema: If OTIO hits a schema it doesn't recognize, it doesn't trigger a parse error, instead a blind object is constructed and carried along. (peachey)
- 312 Documentation for OTIO now lives on readthedocs: https://opentimelineio.readthedocs.io/en/latest/index.html (big thanks to boredstiff)
- Optimizations:
- 357 Tracks now maintain a set to improve 'contains' performance, resulting in (in some cases) 50x speedup for constructing tracks with lots of clips (thanks rogergodspeed)
- 358 Added `range_of_all_children` to return a dictionary of all the ranges of children of a track in the space of the parent (equivalent to `range_in_parent`). This sped up the flatten algorithm considerably.


Small Changes:
- 335, 325, 301 Improvements to the AAF reader (including support for handling muted clips)
- 299 Now commandline tools are organized into a 'console' module so that pip install correctly installs them
- 355 otioview, otioconvert and otiocat grew a commandline argument to disable the medialinker -m none
- 291 Builds now also include Python 3.6, to keep up with the VFX platform. (boredstiff)
- 359 Ensure that constructors copy values for things that shouldn't be referenced.

otioview:
- 302 otioview now has a number of keyboard shortcuts that make it easier to navigate (bonpix)
- 321 Dark mode for otioview (boredstiff)

As usual, other small fixes and improvements.