Update Virtual Table Copy (Waiting on Copy Type Fix)

[ajbeach]

Currently the signature for copying a type is void ?{}(T &, T); put there are plans to change it to void ?{}(T &, T const &).

When that happens the copy field of the base exception virtual table should be changed from void (*copy)(TYPE *, TYPE *); to void (*?{})(TYPE &, TYPE const &); (TYPE is the exception type name.) This will remove the need for the intermediate function to change the type signature.

This is the same trick used to change void (*free)(TYPE *); into void(*^?{})(TYPE &);.