Now only Graphics.render() could be called.

[DEL] Removed Game.render().
[DEL] Removed Scene.render().
Restructured render process.

[NEW] Added Graphics.addDrawable().
[NEW] Added Graphics.removeDrawable().
[ENH] Now only Graphics.render() can draw things.
[DEL] Removed table.clone().
[DEL] Removed table.merge().
[DEL] Removed Graphics.addViewport().
[DEL] Removed Graphics.removeViewport().
[DEL] Removed Graphics.getBackgroundViewport().
[DEL] Removed Graphics.getWindowViewport().
[DEL] Removed Viewport.addDrawable().
[DEL] Removed Viewport.removeDrawable().
[DEL] Removed Viewport.dispose().
[DEL] Removed Viewport.disposed().
[DEL] Removed Viewport.render().
Fixed the rehook of updating and rendering.

[FIX] Fixed the rehook of updating and rendering.
[FIX] Fixed the missing module in SpriteBase.