Add Player Controls feature

[marcelveldt]

Introduce a "Player Controls" feature so the user can define how to handle power, mute and volume controls for players.

• In the Player settings you can now define a "control" for Power, Mute and Volume.

  • The default control for each category is "native" if the player supports it natively.
  • If a player does not support a certain control (e.g. power), it will use "NONE" as control, so no control.
  • The UI will only show a power/mute/volume control if there is one assigned on a player.
  • The HA integration will also be informed by the control and enable features based on the enabled controls.

• For power, we introduce a "fake" power control, so users can go back to the previous behavior if they want that every player can be turned on/off if they like that for sorting/consistency reasons.

• The HA plugin provider has been adjusted so it can provide "controls" to MA.

  • For power controls, you can use entities that can be turned on/off and have a boolean state. Currently switch, and input_boolean but we also accept media_player.
  • For mute controls, you can use entities that can be turned on/off and have a boolean state. Currently switch, and input_boolean but we also accept media_player (where mute state will be mapped).
  • For volume controls, you can use entities that can have a numeric value/state. Currently input_number, and media_player (where volume_level will be mapped).