build: fixed eclipse build on Windows for PX4
Rover: change PX4 main baud rate back to 115200

we now use USB console
Copter: change PX4 main baud rate back to 115200
    
we now use USB console
Rover: removed obsolete files
Rover: default magnetometer to enabled

will be disabled by auto-detect code if not attached
Rover: don't override declination on startup