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/Feature.cpp

@@ -36,8 +36,7 @@
 
 #include <Base/Exception.h>
 #include "App/Document.h"
-#include "App/Plane.h"
-#include <App/Line.h>
+#include "App/OriginFeature.h"
 #include "Body.h"
 #include "Feature.h"
 #include "Mod/Part/App/DatumFeature.h"
@@ -140,8 +139,7 @@ const Part::TopoShape Feature::getBaseTopoShape() const {
 
 bool Feature::isDatum(const App::DocumentObject* feature)
 {
-    return feature->getTypeId().isDerivedFrom(App::Plane::getClassTypeId()) ||
-           feature->getTypeId().isDerivedFrom(App::Line::getClassTypeId()) ||
+    return feature->getTypeId().isDerivedFrom(App::OriginFeature::getClassTypeId()) ||
            feature->getTypeId().isDerivedFrom(Part::Datum::getClassTypeId());
 }