PX4FirmwarePlugin: Virtuals should be override not final

Add Simple flight mode for multi-rotor

Disable scrolling on QGCComboBox

Fix shutdown crash

SimpleMissionItem: Correct init of _editorQml

This way third parties can use PX4FirmwarePlugin as base class and
override as needed

Added altitude to the Vehicle coordinate (QGeoCoordinate)

Add lights brightness steps to APMLightsComponent page

Complex Item: Fixed Wing Landing Pattern

Move video settings to new SettingsGroup mechanism

Disable CompassMot for Sub

Root loader

Added a root loader to help deep nested children to show an element in the middle of the root Window.

PX4 FW enable acro and rattitude

Complex Item: More work in Fixed Wing Landing Pattern

Add support for SettingsFact::visible

Remove deprecated methods

Paring back OS X travis to installer only

These are covered by SettingsGroups now

Put temperature readings in vehicle values widget

Add calibrate pressure button in sensors page, enabled only for ArduSub

Fix Sub safety summary descriptions

Update parameter metadata for Sub

fixed uploading of bin files

Complex Item: Fixed Wing Landing Pattern