Habapp

- Made channel type on a Thing optional
- Fixed an issue with mqtt publish and reconnect

- Log a warning for broken links between items and things
- Fix CI

- Switched version number scheme to CalVer (Calendar Versioning): ``YEAR.MONTH.COUNTER``
- Fail fast when a value instead of a callback is passed to the event listener / scheduler
- Completely removed types and type hints from traceback
- Completely reworked connection logic for openHAB and mqtt
- Added support for transformations
- Updated dependencies:
- Improved performance
- Support for docker secrets and environment variables in the config file
- Support sending scheduler datetimes to an item
- Search in the docs finally works again
- Updated dependencies
- Docs work again

- Re-added `ItemStateEventFilter`
- Improved parsing of `DateTime` values

Fixed a bug where the rule context was not found

This is a breaking change!

- Renamed `GroupItemStateChangedEvent` to `GroupStateChangedEvent`
- Groups issue a `GroupStateUpdateEvent` when the state updates on OH3 (consistent with OH4 behavior)
- Groups work now with `ValueUpdateEvent` and `ValueChangedEvent` as expected
- Renamed `ItemStateEvent` to `ItemStateUpdatedEvent`
- Ignored ItemStateEvent on OH4
- Fewer warnings for long-running functions (execution of <FUNC_NAME> took too long)
- `Thing` status and status_detail are now an Enum
- Added `status_detail` to `Thing`
- `LocationItem` now provides the location as a tuple
- Added support for `Point` events
- Improved item sync from openHAB (no more false item state `None` after startup)
- Improved startup behavior when openHAB and HABApp get started together (e.g. after reboot)
- Fixed an issue with short tracebacks for HABApp internal files
- Doc improvements