Introducing Swipe chords for sus chords, diminished & augmented

Added a new feature. For chords with 3 notes in a line or stack, hold down one and swipe a second finger out to the third note. Vertically you will get a sus chord. Horizontally diagonally upward, you get an augmented chord Horizontally diagonally downward, for diminished chords. Next step will be to detect the horizontal downward case and allow for 4 notes for a complete dim7th chord. Caveat: unlike CornerChords button, repeated tapping is not possible. Ok for sustained harmonies, doesn't work for repeated chords. A better solution is still required!