UI: Back off on C++ inheritance. It wasn't paying off in code size.
UI: Clean up code around tuning step sizes.
UI: Change from vector to array to reduce code size.
UI: Remove key repeat code.
UI: Clean up of switch handling.
UI: Convert touch keypad rendering to C++ idioms.
UI: Remove some superfluous functions.
Remove blink(), which might reappear in the LED API?
UI: Reorder code in handle_joysticks. Better locality.
PCB: Update header components.
PCB: Segmented CPLD paste aperture.