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.

There may be a performance impact involved.

Running under a single call.
This required increasing variable size from u8 to u16.