[platformer-with-tilemap] Add a linear camera following.

[D8H]

Changes:

• Use a smooth camera instead of a direct centering
• Change the platformer character jump settings

Extension PR

• [SmootCamera] Add an action to fix the 1-frame delay. GDevelop-extensions#524

[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/platformer-with-tilemap-camera/examples/platformer-with-tilemap/platformer-with-tilemap.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.

[D8H]

The camera can have a 1 frame delay if the platformer behavior is executed after it or if the object is moved by events. The SmoothCamera extension should probably let the user decide when to apply the following (between the object movement and the rending) to avoid this.

[D8H]

• Camera following in the life-cycle function: 1 frame delay
  https://games.gdevelop-app.com/game-c29f6b40-81cd-422f-b683-372675135e66/index.html

• Camera following after the player movement though an action: no delay
  https://games.gdevelop-app.com/game-5d60504f-534f-4194-b9d0-b0b3649c3fbc/index.html