Convert bool settings to SettingsFact

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

Causing data loss

Use component id from heartbeat

Also removed intermediate param load retry message

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

Includes ability to load params

Fix knots to m/s conversion. Oops.

more conversion stuff

some fixes and added area unit drop down

Conflicts:
	src/MissionEditor/MissionItemStatus.qml

removed comment

finish unit conversion

correcting typos