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Swap printing generalized objects using arc's infrastructure to be the
$-prefixed debug helper, while the erstwhile $print-key-to-host becomes
the primitive print-character to host.
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Also clean up various prints from last few commits.
As a convention, for debugging we always print directly to host.
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This will let me swap in a fake in tests.
Still hacky, though. I'm sure I'm not managing the parameter right in
the chessboard app.
And then there's the question of whether it should also appear as an
output operand.
But it's a start. And using nil to mean 'real' is a reasonable
convention.
If I ever need to handle multiple screens perhaps we'll have to switch
to 1:literal/terminal and 2:literal/terminal, etc. But those are equally
easy to guard on.
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Dog slow, though. Drawing the sprite for a single piece takes 12s or
30ms/pixel for 400 pixels. A third of that is the actual racket overhead
of drawing pixel by pixel, which would in itself be too much. We need
bitblts.
(Black queen pixels derived from http://www.wpclipart.com/recreation/games/chess/chess_set_1,
after scaling down to 40x40 and replacing external white pixels with
transparent ones in Gimp.)
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http://docs.racket-lang.org/graphics/Mouse_Operations.html
Like with the text mode primitives, we still don't have a story for
writing white-box tests for code using these.
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