Unmarshall all QVariant types which has toType conversion functions.
qvariant.lisp:
* Sort *qvariant-types* by codes.
* Make *qvariant-map* as large as needed.
* Use #'identity for invalid QVariants (with type 0).
unvariant: Don't discard unvarianted NIL.
property.lisp: Remove manual QVariant unmarshalling, since QVariant are now handled automatically.
More comprehensive QVariant marshalling.
Less consing qclass-find-applicable-method.
Less consing method-applicable-p.
Less consing qsubclassp.
stop-overriding: new public function. Works like call-next-qmethod,
but doesn't return, it proceeds calling the original Qt method.
Should be used for optimization.
qvariant: Add an explanation comment.
Less consing method unmarshalling in override callbacks.
Fix qclass-find-applicable-method when nothing is found.
method-applicable-p: Make sure that the number of args is correct.