Add OK tests around more function calls.
Add two more todo_wine tests that fail.

Set video memory capabilities, add some checks to SetTexture and
update some comments.

CreateDispTypeInfo returns the typeinfo of a coclass which implements
the described interface.

Implement MAPISendMail, stub MAPILogoff and make the stubs for
MAPIInitialize, MAPILogon{,Ex} and MAPILogoff return success.