&$skin: A variable reference you may set a Skin instance or string key on to
override the skin that will be used for the context.
+'ResetSessionID': Called from wfResetSessionID
+$oldSessionID: old session id
+$newSessionID: new session id
+
'ResourceLoaderGetConfigVars': Called at the end of
ResourceLoaderStartUpModule::getConfig(). Use this to export static
configuration variables to JavaScript. Things that depend on the current page