Add board identifier to vehicle profiles

[Yups1337]

I really like the profiles idea. It helps beginners to have some roughly working default value estimates but also could help organizing the configuration data for each vehicle.

During first connection with a new (unknown) board, the active profile should get this board identifier assigned (as long as there is no other board assigned) or a new profile should be made (with an option to use an existing profile as template).

I think if consequently evolved, this could prevent a lot of misconfigurations crashes.

This includes settings like MAV-ID and Signing Key.

[Yups1337]

During each connection the profile could be updated with:

STAT_DISTFLWN: Total Distance Flown
STAT_FLTCNT: Total Flight Count
STAT_RUNTIME: Total RunTime
STAT_FLTTIME: Total FlightTime
STAT_BOOTCNT: Boot Count