Coldtype

Added
- Support for gif export in `notebook_animation.show`

Added
- Support for configurable `BLENDER_APP_PATH`
- Better support for Windows-Blender workflow

Fixed
- General tidying, particularly for use in `[notebook]`
Removed
- Dependency on `noise` in `[viewer]`

Added
- Restored some audio capabilities, via `audio=` keywords and the new `ConfigOption.EnableAudio`/`KeyboardShortcut.EnableAudio`

Added
- Better axidraw primitives in new `coldtype.axidraw` namespace, demonstrated in `test/visuals/test_axidraw.png`
- New `numpad` special variable that can handle up to 9 special actions, triggerable from the numpad with the viewer enabled
Removed
- Dependency on `PyOpenGL-accelerate` in the `[viewer]` extra — not really sure why that was there to begin with.

Added
- Better MIDI primitives
- `coldtype midi` midi viewer