Allow setting MAVLINK dialect in user_config.pri

Flight Widget

Allow plugins to define a left placement for its custom flight widget.
When placed on the left, the action tool strip is placed on the right side.

Update localization strings [ci skip]

added additional packages needed to build QGC

Mobile Log Download

For mobile, save log downloads next to where everything else is saved instead of straight into the home directory (which is anybody's guess when it comes to mobile platforms).

Missing file extension for QGCFileDialog when loading KML files.

Finer control for plugins

Add GoPro Hero 4

Add support for 64-bit metadata values

MainWindowHybrid: Close app if something goes wrong with item

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

Mouse Bleed Through

Create a "Dead Mouse Area" control to eat mouse events underneath desired area. This is to prevent mouse events from leaking through controls underneath the area.
Replace original "NoMouseThroughRectangle" as this is more versatile.
Prevent mouse through events from leaking underneath the Fly View tool strip.

QML fixes

Adding missing qgcView to QGCMapPolygonVisuals instance in SurveyMapVisual.qml

Joystick axes can now be monitored even when joystick control is disabled

Add highLatency property to LinkConfiguration

Fix bugs in updating priority link