Try to handle more block transfer / tex render cases

Maybe one of these will help that Sakura game's video.  @daniel229, any good?

I think detaching makes sense if there's no rendering one way or another.  I also think there might be cases of deep offsets into a tall texture, hoping to catch them with the ugly 0x04110000 heuristic.  Could break something worst case...

-[Unknown]
Heh, nasty.