Switch to Qt 5.8

Add Sub master to firmware options

QGCOptions: Remove deprecated methods

Control sizing on mobile

Allow setting the video streaming aspect ratio.

Fix indoorPalette overriding

More moves of settings to new support

DropPanel: Showing up under toolbar on short screens

Also correctly set implicitHeight on QGCTextField

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