more ui api changes.

- remove functions such as operator_int(), operator_enum(), operator_string
  this mixed with keyword arguments in a way that made them hard to read.
  Instead, have operator() always return properties rather then needing an argument.

- rename prop_pointer() --> prop_object(), pointer is more a C thing.

- missed item_enumR(), rename to prop_enum()

release/scripts/ui/properties_object.py

@@ -134,7 +134,7 @@ class OBJECT_PT_relations(ObjectButtonsPanel):
         sub.prop(ob, "parent_type", text="")
         parent = ob.parent
         if parent and ob.parent_type == 'BONE' and parent.type == 'ARMATURE':
-            sub.prop_pointer(ob, "parent_bone", parent.data, "bones", text="")
+            sub.prop_object(ob, "parent_bone", parent.data, "bones", text="")
         sub.active = (parent is not None)