Mavlink terrain protocol support

Don't unref _tee - we don't hold reference to this object, it is owned...

Put back ToolStrip titles which were mysteriously removed

Preset work: Allow custom build to specify which presets are built in

Put back ToolStrip titles which were mysteriously removed

TCP probe and pipeline re-initialization fix

Altitude Text fields: Don't show (Rel) additional units label all the time

Are you sure check on preset delete

Support for built-in preset delete prevention

Handle gstreamer signals on main QGC thread to avoid deadlock; Remove video sink from pipeline if pipeline failed to start

Fix altitude mode setting for correct control display

Don't show (Rel) all the time

Fix TCP for Android and iOS

Fix CameraCalc loading

Settings: Allow telemetry settings section to hide

github: Add feature request

Fix load order so isManualCamera returns correct value

Show errors from preset load failures

Allow telemetry settings section to hide

Plan: Structure/Corridor Fix Done Tracing <-> Done PolyFoo in wizard relationship

Fix Done Tracing <-> Done PolyFoo in wizard relationship

Show checklist if needed

Clicking on checklist no longer closes action dialog

Drive Plan view ROI support from firmware capability bits

Plane: Fix waypoint linkage to first item

QGCViewDialog: Remove close dialog from click handlers

Fix waypoint linkage to first item

Add missing hideDialog call

Remove close dialog from click handlers

Vagrant: move to bionic64

xenial fails with this error:

    default: Project ERROR: gstreamer-gl-1.0 development package not found

bionic64 just works.  So move to it :-)

Use VideoReceiverLog category for video streaming stuff

added function to FlightView to show the checklist if switching views from a view other than FlightView and if checklist should be shown

Fix MPEG-2 TS support on Android and iOS