Gilbert

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- Switched from Poetry to setuptools
- Replaced `aiohttp` and `aionotify` to `uvicorn`, `bareasgi`, and `watchfiles`
- Removed `utils.oneshot` in favor of Python's `functools.cached_property`
- Renamed `ClientException` to `ClientError`

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- Relax python version requirements in packaging.
- Expanded type annotations
- Use `functools.update_wrapper` in `gilbert.utils.oneshot`.
- Make `watch` clear templates and do initial render befor waiting.

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- Extracted Watch code
- Fixed watch to recursively find dirs
- Removed `watch` CLI action.

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- Converted `watch` and `serve` commands to use asyncio
- Added `--watch` option to `serve` command.

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- Allow adding items to Collections
- Add type annotations
- Renamed "plugins.collection.Collection" to Selection

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- Improved "gilbert serve" implemetation and options.
- Don't load dot-files from collection.