Made the testing of the timer work.

Makes it consistent with the WebAssembly naming conventions.

Makes use of the `Error` enum to handle errors. This is a better way to handle errors in Rust. It is also more idiomatic.

Allowing frame by frame "navigation".

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.

Made VRAM update possible.

Using static methods instead of global functions.

Faster render and better colors.

Also fixed frame global memory issue in libretro.