Initial merge of JohnRB's changes for Mini MWC support

MINI_MWC_CPPM.hex uses the internal RX
MINI_MWC_CPMM__EXTERNAL_RX.hex uses the external RX (CPPM)
MINI_MWC_SPEKTRUM.hex uses serial port
MINI_MWC_SBUS.hex uses serial port
there is no NORMAL individual channel RX input