Update value visuals to support value ranges

Initial support for value ranges

Value edit dialog

New value editing dialogs

QGCPopupDialog support

Instrument Values: Icon picker support

Icon picker support

Icon support for instrument values

Add missing include

Generic icon set for values display

Icon support for values display

Add support for ScreenTools.defaultFontDescent

Plan: VTOL landing pattern

Update

VTOL Landing Pattern support

Fix blank instrument values page after changing to another page

Fix blank display after page change in instrument panel

Fix incorrect call

Control should have it's own palette

Mobile QGCFileDialog: Show dir location

New grid based values page editor support

New grid based values page editor support

udpdated gps drivers to fix compiler errror

Mobile QGCFileDialog: Show dir location

Remove deprecated QString::sprintf

Correctly set parent of QGCCorePlugin

QGCCorePlugin is currently constructed with a QGCToolbox* toolbx parameter of null. This is because at the time QGCCorePlugin (or an actual custom plugin) is constructed app->toolbox() is null.
_scanAndLoadPlugins() is called as part of the QGCToolbox constructor where all toolbox classes use the same format:
_class = new Class(app, this);

The creation of QGCCorePlugin should follow the same pattern.

The practical issue I had with this is that because the parent is not set correctly, QGCCorePlugin is not destructed when the app is closed. This means any code in the destructor is not run. (QGCCorePlugin itself has as a destructor which is currently not being called).

Plan: New wizard done model

New wizard done model

Plan FW Landing: Drag of land/loiter maintains land distance/heading as appropriate

Drag of land/loiter maintains land distance/heading as appropriate