CopyRects: Unhandled cases (DEFAULT, MANAGED) -> MANAGED, etc.

[AlpyneDreams]

Title.

[WinterSnowfall]

Issues relying on DEFAULT -> MANAGED:

• Impossible Creatures - terrain shadow issues #66
• Xanadu Next needs more CopyRects #82

[WinterSnowfall]

CopyRects is fully implemented now, ever since doitsujin@753c11d, though I haven't seen anything hit SCRATCH copies in practice.