ArduPilot: Support flash bootloader

The idea here is to prevent people from accidentally flashing the wrong firmware

Custom, single firmware upgrades were fixed to "stable", even if the user selected "custom".
The code, when selecting the firmware type was using the combo box model index instead of the actual type defined by the list model.

Adding missing qgcView to QGCMapPolygonVisuals instance in SurveyMapVisual.qml

Remove zip experiment.

This will make setup pages respond accordingly to armed state
transitions. This will also allow the settings on a page to at least be
visible while they are disabled.

Instead of hardcoded "QGroundContorl" strings

* Add support for another board

* Added a 2nd custom board

Android done.

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

3DR Radios no longer exist

- Added new Advanced visualization

This was causing problems with auto-connect after a flash

This reverts commit bf31c808.