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/Gui/ViewProviderPart.h

@@ -56,7 +56,7 @@ public:
 
     virtual bool doubleClicked(void);
 
-    virtual bool onDelete(const std::vector<std::string> &);
+//    virtual bool onDelete(const std::vector<std::string> &);
 
     /// helper to set up the standard content of a Part Object
     static void setUpPart(const App::Part *part);