[Urwid] Twisted version of generic_main_loop

[Walter Mundt]

Ian Ward wrote:
> It's a good start.  I was hoping this could be done with
> get_input_descriptors[1] and get_input_nonblocking[2] instead of using
> threads.
> 
> [1] http://excess.org/urwid/reference.html#Screen-get_input_descriptors
> [2] http://excess.org/urwid/reference.html#Screen-get_input_nonblocking

Done.  Also, this version adds a handle_reactor parameter.  If False, 
rather than looping the function simply returns a twisted Deferred that 
will trigger when the UI shuts down, whether via an ExitMainLoop call 
(callback True) or a different unhandled exception in one of the 
handlers passed in (errback).

-Walter

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