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

Adding missing qgcView to QGCMapPolygonVisuals instance in SurveyMapVisual.qml

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")

Also rename QmlPageInfo to QmlComponentInfo to cover more use cases

Used to display items associated with Flight Plan on Map