Minor Visual Changes for Environments (#470)

* Minor changes to ensure a common visual language.
    * Agents are blue (or additionally red in competitive scenarios).
    * Interactable objects are orange. 
    * Goals are green when objects, and checkerboards when places.
    * Not everything perfectly follows this, but things are mostly consistent now.
* Renamed "Banana" folder to "BananaCollectors"
* Ensured all brains were set to "Player"
* Moved non-shared assets out of the "SharedAssets" folder.

Author: awjuliani

docs/images/balance.png

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