Add Graupner SUMD input (set serial_baudrate to 4).
Force sane baudrate on RX if using the 'magic' ones.
Enable validation of PPM input.
Size optimizations.
fix little bug in PPM validation
TX:SBUS optimize for size
Shaving a few more bytes
Enforce style
Merge branch 'master' into 20-standalone
Merge branch 'master' into 19-bcom-in-c
Merge branch '19-bcom-in-c' into 20-standalone
Merge branch '20-standalone' into 21-bool