Habapp

- Added HABApp.util.functions with min/max
- Reworked small parts of the file watcher
- Doc improvements
- Dependency updates

- Optimized AggregationItem
- HABApp logs are now included by default in Frontail on openhabian
- Fixed a bug where HABApp and logging config was not reloaded

- added Eventfilter
- added '-b' or '--benchmark' as a cmd argument to run some benchmarks
- *.items file for textual thing config gets properly appended (fixes 199)
- Updated docs (closes 197 )

- Reworked cmd args
- Reworked shutdown
- Duplicate items no longer show full traceback for textual thing config
- Added logger for file events which can be enabled with HABApp.file_events

- Text header is now properly set (fix for empty strings with Openhab 3)
- Added info about installation through openhabian

- MQTT creates items in HABApp only for messages with persist. Events still get created, even if the item does not exist.
This shouldn't be but could be a braking change.
- Removed many deprecated functions
- HABApp will now use the openhab log folder as a log-default when started for the first time on a openhabian installation
- Reworked MQTT connection so it is now a module, too (Item/Rule interface stays the same)
- Better error message when rule files are executed outside of HABApp
- Added lots of documentation

- items can use ``timedelta`` in ``watch_change`` and ``watch_update``
- Added possibility to specify references in thing config
- ``MqttItem`` does no longer inherit from ``Item``
- Added ``MqttPairItem``:
An item that consolidates a topic that reports states from a device and a topic that is used to write to a device.
- Updated documentation (big thanks to yfaway)
- Removed skipping of ``set_value`` and ``post_value`` in docs