- Cleanup whether types passed to functions are evaluated or not.
At this point, I think types should always be evaluated. That means
passing a quote character in front of non-keyword types. So
:char and '(:array :char) is the way types should be specified.
This may involve stripping the (quote ...) for some implementations
like CMUCL which doesn't evaluate the type argument.

- Cleanup the meaning of (def-array). Add size parameter

- Split implementation-dependent code into separate files in preparation
for MCL and CormanLisp ports.