Reduce memory footprint of Plan/Fly mission handling

Carry over speed/gimbal for defaults from previous items

Plan: Sequence number fixes

Fixed bugs the unit test found

Number calc doesn't work so hiding for now

Support for detailed Geo and UTM position editing

Support custom gimbal angles in Structure Scan

Add video popup

MissionController: Add takeoff only with supported vehicles

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

QGCViewDialog controls can now call QGCView.showDialog to stack dialogs

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Allows FirmwarePlugin::toolbarIndicators to signal change

Needed to support different indicators for advanced mode

Properly handle default (initial) map coordinates and zoom level.

'manual control lost' when connected joystick with armed UAV

Allow pseudo mobile builds (Native QML on Desktop)

Replacement code to speed up work on the map and fighting mistake 'manual control lost' when connected joystick with armed UAV

fix typo which breaks joystick detection on Android

fix compile with glibc 2.26

Speech will work on Linux only with Qt 5.9.2, updated accordingly.

Switch Appveyor to Qt 5.9.2

Video Stream Control Widget

Added a signal handler to force toggle the switch. Not sure why the normal signal is not being respected.

Moved "Grid Lines" out of General Options and into the Video Stream Widget
Made a QGC custom Switch element

Clarify the title of the "Video Stream" panel (instead of just "Video")