Fix for custom property editor when property id's contained quotes

Adds bpy.utils.escape_identifier()

release/scripts/modules/bpy/utils.py

@@ -25,6 +25,7 @@ not associated with blenders internal data.
 
 __all__ = (
     "blend_paths",
+    "escape_identifier",
     "keyconfig_set",
     "load_scripts",
     "modules_from_path",
@@ -48,7 +49,13 @@ __all__ = (
     "user_resource",
     )
 
-from _bpy import register_class, unregister_class, blend_paths, resource_path
+from _bpy import (
+    escape_identifier,
+    register_class,
+    unregister_class,
+    blend_paths,
+    resource_path,
+    )
 from _bpy import script_paths as _bpy_script_paths
 from _bpy import user_resource as _user_resource