This primarily is to avaoid stalling the main loop when beeping and
flashing.
This is needed because oneshot ESCs do not receive updates when the main
loop is stalled.
Additionally the beeper code for sticks held in disarm position is
changed since it also clashed with profile selection. Now profile
selections can be seen and heard clearly.
Other subsections of the system that changed the LED0 state while the
main loop is running have been updated to use the status indicator API
instead of blindly hitting the hardware which previously caused lots of
odd LED flashing behaviour - now it is consistent.
