Support 5 positions per aux channel and configuration of 12 aux channels.

Do NOT use old any version of onfgurator. Minimum configurator version is 0.51.0.
WARNING: REMOVE PROPS WHEN TESTING!
WARNING: Do not use your old aux config dumps from the CLI.

RX channels positions are:

LL < 1200
L  1200 - <1400
M  1400-1600
H  >1600 - 1800
HH >1800

5 positions, not 6 positions, were chosen because:
a) it fits in the flash better
b) it fits in ram better (all flags fit in 60 bits)
c) it’s easier to transition to, since there is still a Low Middle and High