Set RC To Param support

Use new QGCPopupDialog mechanism

Tweaks to Popup visuals

Update value visuals to support value ranges

Initial support for value ranges

New value editing dialogs

QGCPopupDialog support

Icon picker support

Add missing include

Icon support for values display

Add support for ScreenTools.defaultFontDescent

VTOL Landing Pattern support

Fix blank display after page change in instrument panel

Fix incorrect call

Control should have it's own palette

New grid based values page editor support

Mobile QGCFileDialog: Show dir location

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).

New wizard done model

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

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

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

Fix return value

Out Survey polygons with KML save