Y2Dmg Emulator

Description notes that the emulator passes (all) of Blarggs test roms, it however only passes a couple. From the comments left in `DmgSystem.cs`, only 15 roms were tested out of the total 46.
Until we have a method of quantifiably measuring any particular emulator's accuracy (with a number for instance), I think we should avoid qualitative descriptions.
Only raising this as an issue as many devs are looking for a readable accurate emulator (including myself) and we shouldn't waste their time.