feat(template/phaser): improve template features

[roaminro]

This PR improves the phaser template by adding a MapSystem that allows for players to spawn and move. As mentioned in #2468 , this system is inspired by the Emojimon example, but only the Movable, Player and Position components are implemented to keep the template simple.

Here's a screenshot with 2 players:

Let me know if you'd like me to change anything.

Closes #2468

[changeset-bot]

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Latest commit: 76cc920

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