The new tor-launcher implementation does not work on Windows

After !348 (merged), Tor files (as TorFile of TorLauncherUtil.jsm) are not found anymore on Windows.

One possible cause is that I've used replace instead of replaceAll for / => \ (since I get NS_ERROR_FILE_UNRECOGNIZED_PATH), but there might be other errors.

Also, TorLauncherUtil.notifyUserOfError is still used, but it doesn't exist anymore, and should not be used.