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.

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

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

The performance should be poor as there're lots of if clauses.