Step - Add Select mode and button for synths

[teotigraphix]

• Add isSelectionEnabled on GroovePhrase

SelectMode enabled

• selects view trigger index
• allow pitch changes

SelectMode disabled

• toggles trigger on/off keeping pitch, velocity and gate exactly the same.
• also updates the note edit overlay's selected key (if selected or not)

Make sure gate and velocity edit are passing the right pitch when updated.