Arch: Misc improvements for IFC workflow

* Added utility to make non-parametric Arch component
* Ability for all Arch components to be a clone of another Arch component of same type
* Modified the Draft Clone tool to produce Arch Clones if applicable
* Fixed Arch Roofs so they can be based on a solid shape like other Arch objects
* Ability to change the Root element to be imported in IFC preferences
* Ability to import IFC files also as compounds, Part shapes or non-parametric Arch objects
* Added an "only" parameter to importIFC.open() to import only a certain object ID.
* Ability to read colors (IfcSurfaceStyle) from IFC objects

src/Mod/Arch/ArchWindow.py

@@ -636,6 +636,10 @@ class _Window(ArchComponent.Component):
 
 
     def execute(self,obj):
+        
+        if self.clone(obj):
+            return
+        
         import Part, DraftGeomUtils
         pl = obj.Placement
         base = None