App/Origin: big refactoring

- Rebase App::Origin on App::DocumentObject
 - Keep all control over the Origin structure inside the Origin and it's
   ViewProvider
 - Add OriginFeature class as common base for App::Plane and App::Line
 - Rebase App::Plane and App::Line on top of newly created class and
   move to the file.
 - Change Origin's ViewProvider API associated with temporary display
 - Lots of associated changes to files
 - Several minor fixes
 - Lots of new bugs

src/Mod/PartDesign/App/DatumCS.cpp

@@ -29,9 +29,7 @@
 #include "DatumPoint.h"
 #include "DatumPlane.h"
 #include "DatumLine.h"
-#include <App/Plane.h>
 #include <App/Part.h>
-#include <App/Line.h>
 #include <Base/Exception.h>
 #include <gp_Pln.hxx>
 #include <BRepBuilderAPI_MakeFace.hxx>