Autotest: common.py add new base class and test
Autotest : Common add heartbeat handling on wait_mode timeout
Autotest: common.py add reach_heading_manual and reach_distance_manual
Autotest: new autotest implementation for Rover
Autotest : rover add drive_square test
Autotest: new autotest implementation for Copter
Autotest: new autotest implementation for Plane
Autotest: new autotest implementation for Sub
Autotest: new autotest implementation
Autotest: new autotest implementation for QuadPlane
Autotest : Sub disable GCS_Failsafe on autotest to prevent timeout. The failsafe aren't currently tested on Sub