PartDesign: body is responsible for visuals

-Hide all visual properties of features when they are part of a body
-Propagate all body visual changes to features
-Separate display mode from body mode to enable setting display mode for both "tip" and "through" modes
-Use default visuals for body shape and only make "through" a new display mask mode for the children

src/Mod/PartDesign/Gui/ViewProvider.cpp

@@ -222,3 +222,18 @@ bool ViewProvider::onDelete(const std::vector<std::string> &)
     }
     return true;
 }
+
+void ViewProvider::setBodyMode(bool bodymode) {
+
+    std::vector<App::Property*> props;
+    getPropertyList(props);
+    
+    for(App::Property* prop : props) {
+        
+        if(prop == &Visibility ||
+           prop == &Selectable)
+            continue;
+        
+        prop->setStatus(App::Property::Hidden, bodymode);
+    }
+}