Support for termination failsafe in PWM out driver
Add command to run termination failsafe
IO firmware supports termination failsafe
support termination failsafe in IO driver
Do not enter RC override if FMU is lost and termination failsafe mode requested
Make sure we got to valid input at least once before kicking in failsafe
Introduce FMU initialised status flag, only run failsafe trap if initialized once
Merge pull request #1327 from PX4/termination_failsafe

Termination failsafe