…ebugging.

…ce of detectors and ignore references to detectors that aren't configured (likely due to typos in the config file or hardware faults)

- Support structure for new 'progress' bottom box display option. Strobe is still default. Progress itself still needs debugging.

* Now use Cerberus to validate configuration
* Adjustment of main module methods and settings to be consistent with configuration structure.
* Lots more docstrings.
* Partial documentation updates.

…ey wouldn't publish unless repeating was forced.

* Convert some state checks to use constants.
* Improve MQTT logging segregation.
* Add MQTT Select discovery to create System and Bay Command selectors.
* Add Detector Quality discovery.
* General syntax and clarity cleanups.

* Update logging
* Convert to constants.
Config:
* Convert more items to explicit pint quantities.
* Add font as a config option.
Core:
* Rework trigger creation.
Detectors:
* Fix longitudinal percentage handling.
* Add distance limiter for laterals.
Display:
* Add parameters for mqtt image control.
* Update to new Intercept namedtuple from Bay.
Network:
* Add discovery for bay motion timer

* Updated to use the data_ready method from the base library.
* Properly return values if the base library returns None.
* Split sensor recovery reading into separate _recoverable_reading method for clarity.

…eing not intercepted.

Add a beyond range detector quality constant.

Laterals now have an intercept property.
Laterals now check for interception during quality evaluation.

Trap errors on AW9523 reset.

Explicit custering parameter for TFMini sensor.

Display hollow boxes for non-intercepted laterals.
Fix non-quatity displays for range.