Correction of Apple TV Commands

[zimmra]

1. properly reference atv commands
2. Add atv command for power/sleep control

All commands referencing atv config variable were previously using the command_left command

Also noticed no accomodation for power/sleep control of the Apple TV Added sleep command per official example

I haven't had the opportunity to test yet

[zimmra]

The command_power in /hki-base/addons/remote-control.yaml may need to be chomped

As in, changed to:

  command_power: |-
    - home_hold
    - select

I can test soon to find out, I don't have enough experience with lovelace_gen or multiline references to know without testing