Use component id from heartbeat

* Fix minor spelling error

* Added support for the AUAV x2.1 Flight Controller
    also removed a duplicate entry for MindPX
    from src/comm/USBBoardInfo.json

Adds entries required to correctly identify, download and flash PX4
firmware to the AUAV X2.1 Flight Controller

* Update USBBoardInfo.json

Removed un-needed fallback entries. This has been tested!

Even though it hasn't been supported forever, the files where still
being compiled

Prevent shutdown ordering crashes

No need to add dynamic MockLink comm links

Retry in all the right/possible places. Don’t freak out about things
coming in unknown sequences.

Forcing QGC to use Mavlink V2 if vehicle supports it.

No signing support yet

_finalize methods need information which is not available if all you
have is a mavlink_message_t