Segysak

Document typo fixes
Fix FrozenDict error on setting byte locations of `segy_writer`

FIxes None bug for `click>=8`

Transform 2021 Release:

Contains updates, fixes and improvements from the T21 Hackathon sprint. Thanks to all who contributed!

Major Updates:

- Introduction of baked in ZGY support via Open-ZGY
- Performance improvements to xysel and line selection methods.
- Addition of `segy_freeloader` and `segy_freewriter` for arbitrarily dimensioned seismic.
- First steps towards integration with `subsurface`
- Bug Fixes and Expanded Testing (+60 new tests)
- Many new and updated examples in the examples gallery.
- Addition of 2 hour tutorial and associated notebook.
- Documentation updates/improvements and edits including a contribution guide and COC.

Added `get_affine_transform` to `.seis` for plotting and data transforms.

CLI Converter now handles multiple file input and output with internal for loops.

Bug fix to force header output to fit int32 in SEGY
Conversion of documentation to py files and added IPYNB download to docs.