.lispwords @ d255816ad1d0

Switch from `:keyword` variables to `?symbol` ones

I'm not happy about this, but I think it needs to happen.  It's a lot less
elegant, and it's slower, but it means we can do things like `(with-results
(likes ?who alice) (print ?who))`.

I might revert this later...

(2 code-push-instruction!)
(1 repeat)
(2 define-instruction define-instructions)
(1 with-database)
(3 with-cell)
(2 set-when-unbound)
(1 recursively)
(1 when-let)
(1 rule)