- Add the translations for REG_MULTI_SZ.
- Replace "Zeichenkette" with "Zeichenfolge" as that seems to be what
  Windows uses.
- Fix the size and placement of the "OK"/"Abbrechen" buttons.
- Remove bogus accelerators on some LTEXT entries in dialogs.

The return-path of the code will handle this properly and this also
ensures that the R8G8B8 dxVersion test is reached.

This interface really shouldn't be in a pin, but rather in the
implementation of the filter, since any seeking is done on the entire
filtergraph, so implementing it in the filter makes more sense.

user32: Handle the undocumented behaviour in DefWindowProc for WM_NCACTIVATE that causes the nonclient area not to be redrawn.

If the lParam is 0xffffffff then the nonclient area is not redrawn.

rebar: In AutoSize get the window rc after REBAR_Layout if needed to respect the sizing changes made by REBAR_Layout.