ArduPilot for configurable mavlink stream rates

ArduPilot option to not start mavlink streams

Fixed the core MAVLink receiver. Among other things, it wasn't accounting for fragmented messages.
Fixed code that monitors messages received (and lost)
Added a section within the MAVLink panel to show the current status (for the current vehicle)
Remove some old, unused exposed interfaces

This reverts commit 52160d80.

Shows horizontal/vertical scroll indicators

Moving source files into Vehicles as it is a more coherent place.

Forcing QGC to use Mavlink V2 if vehicle supports it.

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

Android done.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Map control use different border color based on map type

Add scroll height indicators to Flickable