Implemented Maschine knob control

The knob on the Maschine now changes a variable. This can be used in
many scenarios, but it currently rotates the main window view. (The
controlP5 window confilicted with this)
Fixed a bug regarding the Maschine knob

The knob now properly goes through values 0 to 30 and then loops again.
Merge branch 'Roopen-maschine'

Conflicts:
	midi.pde