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

Allowing frame by frame "navigation".

Fixes issue with zip file handling.

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

Making use of the newly added `buildRomData()` method.

Making use of the newly added `buildRomData()` method.

Faster render and better colors.

In the SDL version.