- Move sending WM_MEASUREITEM message for HBMMENU_CALLBACK bitmaps to
MENU_GetBitmapItemSize();
- Save the received bitmap size in the menu item structure as it will
need to be sent in the WM_DRAWITEM message;
-  Move sending WM_DRAWITEM message for HBMMENU_CALLBACK bitmaps to
MENU_DrawBitmapItem();
- This also means that HBMMENU_CALLBACK bitmaps are now supported in
menu bars.