Also move full arenas to a separate list to avoid searching through
them again and again.

This matches the DDK and removes 14 Win64 compile warnings.

twain_32: Add the ability to thoroughly test basic capability types, and add that test for the one capability Wine supports, ICAP_XFERMECH.

If winefile is unable to create a window, it frees the child pointer.
However, it then proceeds to use the child pointer.