guided mode altitude slider better maximum

Add mouse area to the FactSliderPanel in order to avoid unwanted value changes while scrolling

Video recording

More tweaks

PX4 FW default landing altitude 0m

Allow plugin to define default font size, toolbar height and option to display/hide plan view selector.

reboot vehicle from param menu

Increase accuracy of geotags

UI Tweaks

Add message telling QGC is waiting for a vehicle

Fix size and rendering of mission item hamburger button.

Add MAV_AUTOPILOT_GENERIC only once.

Fix crash by invalid socket deletion

Optimize SQL set creation.

MAVLinkLogManager: fix use of wrong variable

Calling delete on a socket callback is not safe and this can crash
QGroundControl. Using deleteLater method from socket to perfom deletion.

previously the start log button was always disabled, even for PX4.

Fixes regression from 9d413108

SDL: warn with SDL error string when joystick feature detection fails

Mission auto load