QGCOptions: Remove deprecated methods

Replaced by new settings capability

Add Mixers tuning page

FixedWing Landing Pattern: More work on visuals

Handle videoSource changes correctly

Allow third-party flight mode overrides

Fix rtspsrc timeout storage type, add a few ms of jitterbuffer

Extract git hash from AUTOPILOT_VERSION message

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