keymap.lisp: do not use key-chord directly, serialize it
keymap.lisp: do not use key-chord directly, serialize it

this allows the distinction of

How does it allow this? Before this change, hash tables had to use
EQUALP instead of EQUAL. EQUAL does not traverse a struct to see if
all of its members are EQUAL, whereas EQUALP does. HOWEVER, EQUALP
does not distinguish between "s" and "S".

jmercouris/NeXT,jmercouris/NeXT