Fix sendNoteOff bug

adding a default velocity of 0 for note offs.  otherwise the interface
method in MidiUart will interpret the arguments passed as being note
and velocity instead of channel and note.  i.e.

MidiUartParent.hh:

inline void sendNoteOff(uint8_t note, uint8_t velocity) {
    sendNoteOff(currentChannel, note, velocity);
  }
Updates to MNMMonoPolySketch - now two config pages.  encoder to turn machine sync on or off
listen for CCs on midi in 2 also
return default value of 255 instead of 0 if param not found
change comment
Fixed bug in MDMonster where sketch 3 wasnt being setup
Remove TetraEditorSketch from MNMMonster
Add MNMMonoPolySketch to MNMMonster
Instantiate tetraEditorPage outside of sketch so that it can be referenced by TetraCcToNrpnTranslator class  :)
Adding TetraCcToNrpnTranslator class to translate incoming CCs to TetraNRPNs

Workaround to allow Novation Remote SL control over Tetra via CCs
Adding TetraCcToNrpnTranslator.  Removing tetraEditorPage instantiation from sketch as it now occurs inline