Stat UI - On change animation

[itstonywu]

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When the score is updated, there should be some kind of animation to indicate to the user that the score has changed.

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The exact animation will worked out. Let's start by changing the score to GREEN if the score increases, and RED if the score decreases.

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[rmcreyes]

In the case where we want fancy animations, this may be a useful library to use: https://www.react-spring.io/