This makes it possible to select CBG or DMG mode taking into consideration the CGB flag in the ROM file.

There's also support for the disable operation.

With initial approach for scalling down the speed of other components.

Adds support for the Zelda Oracle.

Allows the transfer of data according to the specs in dma.rs.

Also removed the not needed bitwise operation.

Avoids constant comparison against wx by cmputing the initial windows index.

By avoiding many of the GBC required operations in the drawing pipeline.

This is only a structure change and no real DMA implementation has been done.

Thsi avoids possible overflow issues.