Purpose: Cleaning up the code base

Acceptance criteria: at the end of this intervention, the Game_World scene delegates to the more specific scenes Foliage, Sea, etc., for the specific details of their implementations, instead of implementing every little detail in the Game_World scene.

Current situation

Currently, z-orders (the depth parameter of objects rendered on screen) are set in Game_World (Events)

Desired intervention

To improve modularity, I suggest that we implement Links, the same it's done in Game, that draws all the events from Links to corresponding groups (one group is Foliage, one group is Sea, and so on).

Operational

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