Gui: Fix header uniformity, whitespace, and doxygen fixes

src/Gui/ViewProviderPart.cpp

@@ -53,7 +53,7 @@ PROPERTY_SOURCE_WITH_EXTENSIONS(Gui::ViewProviderPart, Gui::ViewProviderDragger)
  * Creates the view provider for an object group.
  */
 ViewProviderPart::ViewProviderPart()
-{ 
+{
     initExtension(this);
 
     sPixmap = "Geofeaturegroup.svg";
@@ -90,7 +90,7 @@ bool ViewProviderPart::doubleClicked(void)
     if(!activeDoc)
         activeDoc = getDocument();
     auto activeView = activeDoc->setActiveView(this);
-    if(!activeView) 
+    if(!activeView)
         return false;
 
     activePart = activeView->getActiveObject<App::DocumentObject*> (PARTKEY);