Make sure that that termbox is set up before renderThread starts.

While we should probably ensure proper locking/queing around termbox, this is a "quick fix" that ensures that termbox has been inited before renderThread is started, which will otherwise have race to see who can dump things the fastest to stdout - a race with no winner due to mangled output.

Edit: By inited, I mean that SetColorMode and others have been completed, so that only renderThread has responsibility of termbox. (Apart from the deferred Close)