+ add class ViewProviderPrimitive to avoid to re-implement setEdit/unsetEdit methods for each sub-class separately
+ avoid using global variables
+ when editing a feature directly pass it to the dialogs
+ when editing a feature then do not use active document as this could point to the wrong object
+ fix undo/redo message
+ re-add '3D View' button to location dialog
The path to the icons is added to `AppPartGui.cpp`
using `Gui::BitmapFactory().addPath()`, so the icons are found
automatically in their new directories.
New icons for Parametric Part Primitives
Point, Line, Circle, Ellipse, Helix
Display the icon in tree via independent viewproviders for
Part Parametric Line and Circle
Change Part Box tree icon to display yellow Part Box icon from the tool bar
