Updating examples with tilemaps

[HelperWesley]

Updated examples:

top-down-rpg
-Used tilemap instead of tiled sprites for the level

multiplayer-platformer-pickup
-Used tilemap instead of tiled sprites for the level
-Removed 1 enemy object because it was jittering with the new tilemap object

duck-game
-Used tilemap instead of a single large png for the level and collision objects
-Updated deprecated condition/actions
-Updated and declared all variables

sokoban
-Used tilemap instead of tiled sprites for the level
-Updated deprecated condition/actions
-Updated and declared all variables

tower-defense-war
-Used tilemap instead of tiled sprites for the level

simple-platformer
-Used tilemap instead of tiled sprites for the level
-Updated and declared all variables

[github-actions]

Preview the game(s) changed or added in this Pull Request

• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/Updating-examples-with-tilemap/examples/duck-game/duck-game.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/Updating-examples-with-tilemap/examples/multiplayer-platformer-pickup/multiplayer-platformer-pickup.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/Updating-examples-with-tilemap/examples/simple-platformer/simple-platformer.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/Updating-examples-with-tilemap/examples/sokoban/sokoban.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/Updating-examples-with-tilemap/examples/top-down-rpg/top-down-rpg.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/Updating-examples-with-tilemap/examples/tower-defense-war/tower-defense-war.json

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This is an automatic message displaying links to the games in this PR - double check the JSON in case of doubt.

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 28.8%, saving 90.32 KB.

Filename	Before	After	Improvement	Visual comparison
examples/multiplayer-platformer-pickup/assets/world_tileset.png	15.24 KB	9.44 KB	-38.1%	View diff
examples/simple-platformer/assets/Background_Tileset.png	2.38 KB	1.48 KB	-37.9%	View diff
examples/simple-platformer/assets/World_Tileset.png	10.63 KB	6.11 KB	-42.6%	View diff
examples/sokoban/assets/Tilemap_Obstacles.png	3.93 KB	2.99 KB	-24.0%	View diff
examples/top-down-rpg/assets/TilesetFloor.png	28.91 KB	19.72 KB	-31.8%	View diff
examples/top-down-rpg/assets/TilesetWater.png	23.01 KB	13.39 KB	-41.8%	View diff
examples/tower-defense-war/assets/towerDefense_tilesheet.png	229.16 KB	169.82 KB	-25.9%	View diff

6004 images did not require optimisation.