Includes simple example in main gb.rs file.

Making it possible to indirectly access the registers via constants.

Adds OBP0_ADDR and OBP1_ADDR to the list of registers.

More standard support for the `BusComponent` interface.

Made use of const values to store global data.
Polling is done on every tick, supposedly it's the best approach for libretro.

Makes use of hex based colors to simplify interface.

Allow simple screenshot saving.

Add a more functional approach to frame buffer update, using chunks.
Should improve scalar based processing.

The lazy evaluation is only support for DMG.

In restoring the VRAM

Made VRAM update possible.

Faster render and better colors.

This allows background to take precedence over objects.
This completes the CGB ACID 2 test compliance.