Base: Rename Base::freecad_dynamic_cast into freecad_cast

This is to make it shorter and easier to use. QT does the same thing
with their qobject_cast.

src/Mod/PartDesign/Gui/TaskFeaturePick.cpp

@@ -391,7 +391,7 @@ TaskFeaturePick::makeCopy(App::DocumentObject* obj, std::string sub, bool indepe
 
             // we are a independent copy, therefore no external geometry was copied. WE therefore
             // can delete all constraints
-            if (auto* sketchObj = Base::freecad_dynamic_cast<Sketcher::SketchObject>(obj)) {
+            if (auto* sketchObj = freecad_cast<Sketcher::SketchObject>(obj)) {
                 sketchObj->delConstraintsToExternal();
             }
         }