Hide guided map indicators when vehicle goes away

Better show/hide behavior of guided map indicators

Add gotoFlightMode method

Map Indicator confirm/cancel support

Cleanup unused code

Add gotoFlightMode property

Various fixes

Handle crash on first time switch from disable to enabled
Handle video settings restore after disabling Taisync

Taisync support

# Conflicts:
#	QGCCommon.pri

Moving Android to GStreamer 1.14.4

Off my own server during tests

Remove telemetry heartbeats

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

Add support for Linux and experimenting with settings (there are "set" but no "get" options for them though)