FEM: use python base constraint class, material reinforced

src/Mod/Fem/femobjects/_FemMaterialReinforced.py

@@ -27,10 +27,16 @@ __url__ = "http://www.freecadweb.org"
 #  \ingroup FEM
 #  \brief FreeCAD FEM _FemMaterialReinforced
 
+from . import FemConstraint
 
-class _FemMaterialReinforced:
+
+class _FemMaterialReinforced(FemConstraint.Proxy):
     "The FemMaterialReinforced object"
+
+    Type = "Fem::MaterialReinforced"
+
     def __init__(self, obj):
+        super(_FemMaterialReinforced, self).__init__(obj)
         obj.addProperty(
             "App::PropertyLinkSubList",
             "References",
@@ -51,8 +57,3 @@ class _FemMaterialReinforced:
         )
         obj.Category = ["Solid"]
         obj.Category = "Solid"
-        obj.Proxy = self
-        self.Type = "Fem::MaterialReinforced"
-
-    def execute(self, obj):
-        return