.lispwords @ de6e248866f4

Implement dynamic calling and fix `bind!`

It turns out `bind!` needs to actually *copy* the thing it's binding into the
target, not create a reference.

Dynamic calling was actually pretty easy.

(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)