* Fix a wrong default value in has_feature.
* Add SET_SPEED as supported feature and fix PUR131S speed range
* fix night_light discovery
* fix air quality and filter life sensors
* fix style.
* added LAP-C601S-WUS (Core 600s Air Purifier)
* fix style
* better fix to diagnostic.
* fix preset mode
* add a log line.
* add another debug log
* add some missing fan devices.
* auto discover preset_modes
* auto discover fan speed range
* fix fan speed and preset modes
* fix fan speed number
* add some debug log.
* merge fix from main
* rename a key in diagnostics.