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/App/Document.cpp

@@ -2084,7 +2084,6 @@ void Document::remObject(const char* sName)
         pos->second->unsetupObject();
     }
     signalDeletedObject(*(pos->second));
-    // TODO Check me if it's needed (2015-09-01, Fat-Zer)
     pos->second->StatusBits.reset (ObjectStatus::Delete); // Unset the bit to be on the safe side
 
     if (!d->vertexMap.empty()) {
@@ -2140,6 +2139,7 @@ void Document::remObject(const char* sName)
 /// Remove an object out of the document (internal)
 void Document::_remObject(DocumentObject* pcObject)
 {
+    // TODO Refactoring: share code with Document::remObject() (2015-09-01, Fat-Zer)
     _checkTransaction(pcObject);
 
     std::map<std::string,DocumentObject*>::iterator pos = d->objectMap.find(pcObject->getNameInDocument());