patch [#25809] Auto-Registration as utility function.

This removes auto-registration, committed by Martin r30961.
Realize this is a contentious topic but Brecht and myself both would rather opt-in registration.

TODO:
- addons need updating.
- class list will be modified to use weakrefs (should have been done for existing system too).
- will move bpy.types.(un)register functions into bpy.utils.(un)register_class, currently including these functions in a type list is internally ugly, scripts which loop over types also need to check for these.

release/scripts/ui/space_node.py

@@ -197,11 +197,11 @@ class NODE_PT_properties(bpy.types.Panel):
 
 
 def register():
-    pass
+    bpy.utils.register_module(__name__)
 
 
 def unregister():
-    pass
+    bpy.utils.unregister_module(__name__)
 
 if __name__ == "__main__":
     register()