Add Terrain toggle to MapScale control

Zoom buttons move to MapScale control

Restore QGC to its normal UI layout (buttons on toolbar)

Offline Maps: Allow custom build settings overrides

Get rid of QGCView, QGCViewPanel and FactPanel. All messages and dialogs are now handled in the root window.

Store correct tile set counts for image and elevation sets.

Q_ENUMS is deprecated and should not be usued.

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

Wrap text

* Export should always be enabled since you can export default tile set
* Fix Select All/None problem

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.

For whatever reason, showing the dialog through a function causes a crash in QML (undebugable--new word!)

Internet available now has a signal

This way:
* GCS location is shown
* It follows same centering semantics of FlightMap
* Note: Vehicle is not shown