Ownerdraw status bar should update on receiveing a SB_SETTEXT message,
even if the 'text' parameter has not changed. Fix with conformance
test.

widl: Call Pointer function for freeing non-conformant strings and for all phases for returned non-conformant strings, as is done for conformant strings.

Also call Pointer functions for any string that isn't a reference pointer.

Document how much of hack duplicating a type in order to change its
pointer type is.

It's slightly quicker than calling pointer phase functions and does
the same job.

The generated code should use NdrSimpleType{Marshall,Unmarshall} instead
of direct buffer access, since the memory size isn't always equal to
the size on the wire and extra checks.

user32/tests: Add a couple of optional message, mark as todo a test that now fails consistently on Wine.