OneShot has dropped the old stickability controls almost a year ago, and that's
already part of UPGRADING.md. Remove the note that they will be removed - they
already were.
Signed-off-by: Gergely Nagy <algernon@keyboard.io>
This adds `LEDControl.disable()` and `LEDControl.enable()` which disable and
enable LED operations, respectively. These are meant to replace the current
`LEDControl.paused` property (which is getting deprecated with this change), and
do some additional work on top of just disabling or re-enabling future updates
and sync. Namely, `disable()` will also turn LEDs off, while `enable()` will
refresh them all, too.
We also add a dedicated `Key_LEDToggle` key to disable/enable LEDs. This is
useful when one wants to turn LEDs off, without changing active LED mode to
`LEDOff`.
Signed-off-by: Gergely Nagy <algernon@keyboard.io>