+ introduce proper enum for property status to replace plain integers

src/Mod/PartDesign/App/FeatureDressUp.cpp

@@ -60,7 +60,7 @@ void DressUp::onChanged(const App::Property* prop)
 {
     if (prop == &Base) {
         // if attached to a sketch then mark it as read-only
-        this->Placement.StatusBits.set(2, Base.getValue() != 0);
+        this->Placement.setStatus(App::Property::ReadOnly, Base.getValue() != 0);
     }
 
     Feature::onChanged(prop);

src/Mod/PartDesign/App/FeatureSketchBased.cpp

@@ -243,7 +243,7 @@ void SketchBased::onChanged(const App::Property* prop)
 {
     if (prop == &Sketch) {
         // if attached to a sketch then mark it as read-only
-        this->Placement.StatusBits.set(2, Sketch.getValue() != 0);
+        this->Placement.setStatus(App::Property::ReadOnly, Sketch.getValue() != 0);
     }
 
     Feature::onChanged(prop);

src/Mod/PartDesign/App/FeatureTransformed.cpp

@@ -60,7 +60,7 @@ Transformed::Transformed() : rejected(0)
 {
     ADD_PROPERTY(Originals,(0));
     Originals.setSize(0);
-    Placement.StatusBits.set(2, true);
+    Placement.setStatus(App::Property::ReadOnly, true);
 }
 
 void Transformed::positionBySupport(void)