* Consolidate switch entities to one class
* Move turn on/off into UnifiSwitchEntity
* Add event subscription
Remove storing entity for everything but legacy poe switch
* Only one entity class
* Improve generics naming
* Rename loader to description
* Improve control_fn naming
* Move wrongfully placed method that should only react to dpi apps being emptied
* Improve different methods
* Minor renaming and sorting
* Mark callbacks properly