Igcs 203 ar drone tilt control

The important change is the sendMoveCommand method in the iGCS/Comm/Interfaces/iGCS/iGCSMavLinkInterface.* files.  The rest was to support testing this new method.
add `typedef struct GCSMAVMove GCSMAVMove;` (or whatever you decide to rename this struct to) so that you don't have to type struct in all the declarations