supportedMissionCommands is vehicle class sensitive

Re-architect toolbar for better customization capabilities. Also use less real estate.

This will allow sub users to see if the ROV is in the Roll/pitch toggle
mode using the APMSubInfo section in the info widget

This adds support for the new ArduSub 3.0 feature of automatically detecting
the thrusters directions and reverting the corresponding motor output if
necessary

Remove unused modeCount

Remove the concept of reserved buttons for manual control

Don't starts streams from QGC side. Assume firmware side does the right thing.

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>