Moving Android to GStreamer 1.14.4

Off my own server during tests

Rover isFlying check fix

Move cache location methods so they are available in all builds

Add missing header

Add --clear-cache option

Fix Rover check for isFlying

PARAM_VALUE parsing changes, Rover hack fix

Hack to allow Rover setup pages to work

Assume non autopilot components follow current mavlink param_value spec

CustomCommandWidget.qml:Fix URL

Fix bad cast, which truncates free storage value.

ParameterManager: Fix cases of _logVehiclePrefix usage with missing componentId

Fix cases of _logVehiclePrefix usage with missing componentId

Avoid sending camera commands while a reset is pending.

Orbit: Show center point telemetry and flight mode

Auto video stream

Add support for Orbit flight mode

Show Orbit center from telemetry

Some Android joysticks have axis mapped to multiple channels.

Comms cleanup

Skip serial related code if serial links are disabled.

The Url in custom command widget has been moved to
https://docs.qgroundcontrol.com/en/app_menu/custom_command_widget.html

AutoLoad: Not loading GeoFence or Rally points correctly