SMW DLC MemPak

Super Mario World - World DLC Specs:
DLC: 128KB.
Draft by Seru-kun/LuigiBlood

What the Patch should do: Make SMW check for SMW DLCs in Memory Pack when you select File C (Special).
If there's a DLC, read it. Else, crash the game (for a 1st version it should be simple)
When it finds it, go to the normal overworld, but when selecting a level, read the DLC Level.
The DLC itself should contain:
- Relative Pointers to Levels (Layers, Sprites...)
- Level Datas.