Add a generator that updates a persistent mapping of item (functions, classes, etc.) to the module names they are a member of.
Remove the NO_MODULE dictionary as we're tracking all the item --> module names now.
Consolidate the 2 removeWxPrefix implementations to just one.
Fix taking out too much space in the class index when removing the :ref: for unknown items, which caused ReST problems.
Use pyName if it is set
When renaming classes we also need to change the className in the method objects
Properly deal with nested classes
