Controllers: Add Mapping for Reloop Ready

Initial commit of a mapping for the Reloop Ready controller.
The Padmodes are not implemented and just default to the hotcues
right now. The mapping currently depends on mixxxdj#4474, mixxxdj#4495 and mixxxdj#4512

fix(controllers): Reloop Ready fx2 level knob

Co-authored-by: majekw <majek@w7i.pl>

various features (i'll squash later anyways)

* Add option to correct for offset tempo fader notches
* Improve LED feedback of various buttons when pressing and shifting
* add eject function to load button when shift-pressing
* remove dad code
* turn of big pads when shutting down
* fix 4th pad in ManualLoopPadMode (loop_in_goto)
* Add beatJumpMode for ScratchBank
* fix slip button

Add pitch play mode (WIP) (untested)