Serial settings (QML)

* MavLink/master:
  More reliable radio flash
  Fix autoconnect/re-autoconnect, plus windows connect
  Don't show resource busy errors from auto connect attempt
  Don't pop modal dialog during boot sequence

Conflicts:
	src/comm/LinkManager.cc

More reliable radio flash

Autoconnect fixes

Verify is still failing though

Don't pop modal dialog during boot sequence

Calc/Display azimuth to last waypoint

Tweaks to Flight Mode Config visuals

Map text color

Link Settings (WIP)

Change disconnect model for vehicles

Fix virtual joystick polling rate

small fix to recognize clone px4flow units

This guarantees we are past bootloader on all OS. Window tends to not
detect bootloader, connect to it and then get confused.

Windows OS doesn’t disconnect port when you pull plug on USB. This
caused all sorts of problems with previous logic. New logic handles
this correctly.

Thumb stick

First pass at Comm Link settings (in QML)

* MavLink/master:
  Fix MultiTouch

Conflicts:
	src/QmlControls/JoystickThumbPad.qml

Fix virtual joystick MultiTouch