Use movable content to swap players

[StaehliJ]

Pull request

Description

Use movableContentOf to swap players for multiple player showcase.

Changes made

• Self-explanatory

Checklist

• Your branch has been rebased onto the main branch.
• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).
• All pull request status checks pass.

[github-actions]

Code Coverage

Overall Project	54%	🟢

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[MGaetan89]

I've pushed a commit that mitigates the players from flickering while swapping. But it means that we go back to the previous approach of changing the player assigned to a PlayerView, instead of just moving the PlayerViews.
The flickering was already here before this PR, so if you prefer to keep your approach, I can revert my commit.