modules/asc: implement a simple ascii text module

This just binds the simple libs/txt/txt.c stuff to a rendering
module, exposing the minimal options as settings.

It's handy for testing libs/txt/txt.c, and introduces a module
requiring free-form strings potentially including newlines be
handled properly as settings values.  This latter aspect is
important for improving settings syntax, any improvements must
handle these more complicated scenarios and now there's a good
test case for exercising those nuances.

I suppose there might also be use in the creative process if you
want a text element but haven't got around to hacking up a
prettier module for it yet.  Just use this one temporarily.

See commit for some remaining TODO items.

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