Teach the controller's watchEvent about status_client and how to return raw messages

These are needed by Tor Launcher when it begin using torbutton's controller. Currently, the controller only recognizes stream events, but we need status_client in Tor Launcher. In addition, watchEvent eats the first two keys of the event (the code: 650, and the type: STATUS_CLIENT). We need these in Tor Launcher, too.

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