Code for pure MAVLink Operation

Biggest changes on Libraries and the base-code.
Default operation uses MAVLink msgs for show lenses, foucus_lock,
zooming and triggering.

Default internal APM control:
Shutter Setup --> RC8 (1000 - 2000)
APM Input Channels:
CH5 --> Lenses/Session (1000 to 2000 = OFF to ON)
CH7 --> AutoFocus Lock (1000 to 2000 = OFF to ON)
CH8 --> Zooming Steps (1000 to 2000 = 0 to NumSteps***
***NumSteps is set on __defines.h