maschine3: add support for pedal as button
maschine3: add support for pedal as button

This adds the controls for a pedal - note that there
are two events, one ordinary, the other as inverted.
This is to accomodate foot-pedals with different
polarity (press to connect, or press to disconnect).

Signed-off-by: Harry van Haaren <6e1296516ee88185cd60d9725251227ece1af74d@gmail.com>

openAVproductions/openAV-Ctlra