* This adds a **Light** object that can be added on the scene, with a customizable color and radius.
* Add the **Light Obstacle** behavior to the object that must acts as obstacle (walls, etc...) to the lights.
* You can customize the ambient color of the rest of the scene from almost white (useful to show light shadows) to entirely black (useful for horror/exploration games) or any color.
* Use effects on the "Lighting" layer like "Kawase Blur" to achieve soft shadows.
This means that the global object PIXI will now be properly typed and understood by TypeScript.
Also fix documentation generation
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