ArduPPM: Changed the behaviour of the PPM encoder: if a channel is lost retain its last value instead of a fail-safe value (except for Ch3/throttle)
ArduPPM: Set Ch1-4 to their fail-safe position and leave Ch5-8 at their last value
Update Tools/ArduPPM/Libraries/PPM_Encoder.h

- Small optimization
PPMEncoder - bug fix from previous commit
ArduPPM: Versioning cleanup, 2.3.16 should be the next official release
ArduPPM: version 2.3.16 for release