Merge pull request #111 from teotigraphix/master

TrackModes first & second row buttons behave like Ableton with mute/rec arm
Added if [Shift + top row button] arms/disarms track record.
Fixed Session flip mode, uses same logic to arm scene buttons.
- Going along with the refactor of 1st & 2nd row buttons, flipped
scene selectors are in row 1 and track mutes are in row 2.