Minimize time with interrupts disabled, this should solve issues
with PPM glitching with OrangeRX/Flytron gear.
Rename miniRX to microRX to avoid confusion with the 6ch with USB.
Support for Flytron/OrangeRX TX as receiver, this is completely untested atm.
Fix RX ID numbers
Add 'static beacon' mode, emit single tone for 20s at full power
in place of fading tune.
Version 3.7.2

- Add possibility to use TX (OrangeRX/Flytron) as RX (makes sense for 1W TX:s)
- singletone beacon mode
Bug fix for operation with slave present.
More clear LED behaviour with slave.
Adding 'AltPower' mode, this makes every n:th packet sent at lower power.