Ndspy

* Replaced the `crcmod` dependency with a pure-Python CRC16 implementation in ndspy itself.
* Fixed a bug in the undocumented `ndspy.graphics2D` module.
* A few documentation improvements.

* Many bugfixes. Thank you to everyone who reported bugs!
* The `ndspy.codeCompression` and `ndspy.lz10` now have CLIs. They also gained convenience functions for compressing and decompressing to/from files rather than :py:class:`bytes` objects.
* `ndspy.bmg.BMG` now calls encoding value 1 `'cp1252'` rather than `'latin-1'`; the latter was just a guess on my part. It also gained a new read-only attribute `ndspy.bmg.BMG.fullEncoding` that is useful for manually decoding BMG strings, in case you need to do that for some reason.
* `ndspy.rom.NintendoDSRom.iconBanner` now supports all versions of icon/banner data, not just the first version. The `ICON_BANNER_LEN` constant has been removed, since it is not actually meaningful (different versions have different lengths).
* `ndspy.Processor` is now an `enum.IntEnum`, rather than just an `enum.Enum`.
* Assertions now have messages indicating what went wrong.
* The `ndspy` and `ndspy.bmg` modules now have unit tests.
* Changes pertaining to undocumented modules:

* `ndspy.color`'s API has been redesigned. However, this may be reverted or redesigned again before the module is stabilized.
* Almost all `ndspy.texture.TextureFormat` enum members were renamed.
* `ndspy.graphics2D` got further API improvements.
* `ndspy.extras.music` now automatically parses unparsed *SSEQ*s.

* Completely redesigned `ndspy.narc`'s API in order to add compatibility with *New Super Mario Bros.* This is a very backwards-incompatible change, and any code using the module definitely needs to be updated.
* Medium-sized changes to `ndspy.bmg`'s API in order to add compatibility with... pretty much game except *The Legend of Zelda: Phantom Hourglass* and *The Legend of Zelda: Spirit Tracks.* This is a pretty important change, of course, but it's also backwards-incompatible. Depending on what parts of the module your code uses, though, your code might still run correctly without any changes.
* Converted the names of `ndspy.soundSequence.MonoPolySequenceEvent.Value` and `ndspy.soundSequence.VibratoTypeSequenceEvent.Value` members to upper-case, since that's the recommended style for enum members now. This is backward-incompatible, but only if your code uses these enums.
* Added the first two tutorials to the documentation, and added example code for certain modules.
* Reorganized the folder structure of the documentation. This makes most previous documentation links invalid, unfortunately, but the reorganization was done with an eye toward avoiding this having to happen again in the future.
* Changes pertaining to undocumented modules:

* `ndspy.bnbl` and `ndspy.bncl` were added
* `ndspy.graphics2D` got some API improvements
* Swapped the interpretation of alpha values in `ndspy.color`
* Added the ability to render textures with `ndspy.texture`

* Updated the `ndspy.soundBank` API to reflect the new discovery that note definition type values are defined for all instrument types, not just single-note instruments. (Thanks, Gota7!) This is a backwards-incompatible change, hence the major version number bump.
* Fixed some bugs in `ndspy.soundBank` and `ndspy.soundSequence` that caused crashes in some situations. If your code didn't crash on 1.0.x, this doesn't affect you.
* Added `ndspy.VERSION`.
* Added a changelog page to the documentation.

This fixes a mistake in setup.py that allowed ndspy to attempt to install on versions of Python that are too old. No actual ndspy code is changed.

First release of ndspy.