Add GDK_MEMORY_A8B8G8R8_PREMULTIPLIED
We did have 4 ordering variations of ARGB straight, but only 3 premultiplied. Add the missing one.
Update all the places where we switch over memory formats.
We did have 4 ordering variations of ARGB straight, but only 3 premultiplied. Add the missing one.
Update all the places where we switch over memory formats.