OLED speedups, compression, second display buffer, scrolling support.

Full screen HAD logo display time reduced from 513msecs to 99msecs.
Full screen of 5x7 font write time reduced from 400msecs to 200msecs.
Storage for HAD logo dropped from 8KB to 3.8KB using run-length encoding compression.
Second display buffer enabled for SSD1322.  Allows writing to inactive buffer and fast update to display.
Adding scrolling support from inactive to active buffer and for screen clears.
Updated mooltipass app to use second display buffer and scrolling effects.