Unbricked doesn't use OAM DMA

Currently, the Unbricked code directly accesses OAM in VRAM, which is slow and error-prone.
The Game Boy has the OAM DMA feature for a reason. It's the correct way to update OAM.

Locate the Unbricked code that directly accesses OAM in VRAM and inspect how its OAM updates are performed. Use the Game Boy OAM DMA feature as the relevant entry point, then verify that Unbricked still updates OAM correctly without direct VRAM access.

索引モデルが issue の本文から書いたものです。