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.

Support for Game Boy Color (CGB) 

Closes #8

See merge request !16

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.