Update and clarify much Sprite API. Claim various SOPs (retrospectively) as...
Update and clarify much Sprite API. Claim various SOPs (retrospectively) as suggested by Allocations. Document much undocumented stuff.
Feel free to s/Cerilica MetaSprite/Third Party/ if desired.
Also, defining things as “new Foobar” or “another new Foobar” is deeply unhelpful. Let’s stick proper names on things, such as SpriteType and ExtendedSpriteType.