Add Distance to GCS to Vehicle FactGroup

Prevent clicks going through top level items

Added (UI) support for vehicles exposing more than one camera.

Adding missing qgcView to QGCMapPolygonVisuals instance in SurveyMapVisual.qml

Handled "airspace visible" state (not done)
Adjusted restriction map items color and opacity
Added/Updated icons for airspace traffic
Adjust colors for text over maps

Eliminated flight widget "states"
Define flight widget top margin (plugin options)

Adjust colors
Remove unused image

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

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")