Flymaple: RCOUtput disable_ch() now supports disabling outputs
AntennaTracker: now supports mavlink arm and disarm commands to disable antenna servo outputs
AntennaTracker: finish adding GPS support, including using relative or absolute altitudes
AntennaTracker: use gcs[] array instead of old idiom gcs0, gcs3
AntennaTracker: add support for MANUAL and AUTO modes
AntennaTracker: initial documentation
AntennaTracker: update documentation
AntennaTracker: Improvements to yaw slewing and ballerina mode