Habapp

Changes and Bugfixes:
- Fixed a bug where the item watchers would not work after deleting and immediately adding an item again (e.g. *.items file change)
Closes 184
- BaseWatch has now a function which listens exactly to this event
- ItemTimes.add_watch accepts a timedelta, too
- If a file depends on another file that doesn't exist and that file gets added the depending file will be loaded correctly (fixes 186)
- A file with duplicate rule names will no longer break the file load (fixes 187)
- Item registry: renamed set_item to add_item which also raises an exception if the item already exists

Small improvements
- EventBusListener can filter on event properties
- creating/canceling an item watch gets now logged

As always:
- Updated requirements
- added some tests and documentation

- Increase http buffer to 512k (now allows 383k image size)
- reworked ping handling
- Updated requirements

- Ping handling should be more robust
- Fixed an issue where HABApp would not reconnect after an error
- Doc fixes by Rosi2143
- Added DictParameter which can be accessed like a dict
- Reworked file handling:
It is now possible to specify files as dependencies which will be loaded before the specifying file and it is possible to automatically reload a file if another file changed. The topics for file handling changed, too.

- updated dependencies
- added armv7 and armv6 as docker builds
- activated tests for python 3.9

- Added ThingFirmwareStatusInfoEvent (fixes 175)
- Bugfix for scheduler (fixes 174 )
- Added github actions

- Support for OpenHAB 3
- bumped dependencies