- Effectively similar to Actors, but without the excess.
- Can be created with either the `level` function or the static `Spawn` function in ZSprite.
- STAT_SPRITE belongs to ZSprites only; ZSprites cannot be moved out of, nor can anything else be moved in to, this statnum.
Misc:
- Fixed (Sprite)Offset taking roll into account.
Crediting phantombeta, RicardoLuis0 and RaveYard for assistance.
* add QualifiedName to VMFunction and allocate these static names from the class data memory arena instead of using FStrings.
* null pointer type checks in the VM added to avoid crash on bad codegen.
