* Holds all the settings for the app
* Allows core plugin to override default values

Use component id from heartbeat

- Shot Interval in Survey
- Much change to time/distance calc

Prevent shutdown ordering crashes

Also changed GPS FactGroup values to use NaN appropriately to show
unavailable values.

* Moved from UAS
* Remove unused code

Forcing QGC to use Mavlink V2 if vehicle supports it.

Also added new FirmwarePlugin::brandImage support

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

Includes ability to load params