Wai.annotations

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- Made help more helpful.
- Added macros, which allow for simple command-line argument substitution.
- Improved logging during split-writes. More improvements to come.

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- Separated base reader/writer functionality into abstract bases which don't assume
local disk access.

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- Added new option to the MS-COCO format to sort the categories.

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- Added new options to the MS-COCO format for pre-specifying the categories to expect.

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- Added domain information to the `--list-plugins` command.
- Basic support for speech annotations, including CommonVoice and FestVox formats.
- Added `--debug` global flag to aid in debugging.
- Added file_iterator method to conversion chains, allowing iteration over the converted file-data.
- Fixed dependency error on installation from PyPI caused by pycocotools.
- Bug fixes.

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- Major restructure to introduce domains other than object-detection in images.