638 - quick spike: syntax highlighting in repl

Backspace kinda works. Parens are colored in three rotating colors which
helps with balancing. Comments and strings are colored.

But it's hard to handle backspace in all situations. Like if you
backspace over a quote you have to either quit the string-slurping
routine you're in, or return to string slurping mode. Similarly for
comments; *there* you don't even have a end delimiter to let you know
you're back in a comment. You have to keep track of what came before.

I experimented with a library but it interacts poorly with the charterm
library I'm already using. Ended up with a gross inefficient approach
instead.

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