ML-Agents Branding & Color Updates (#2583)

* new env styles rebased on develop

* added new trained models

* renamed food collector platforms

* reduce training timescale on WallJump from 100 to 10

* uncheck academy control on walljump

* new banner image

* rename banner file

* new example env images

* add foodCollector image

* change Banana to FoodCollector and update image

* change bouncer description to include green cube

* update image

* update gridworld image

* cleanup prefab names and tags

* updated soccer env to reference purple agent instead of red

* remove unused mats

* rename files

* remove more unused tags

* update image

* change platform to agent cube

* update text. change platform to agents head

* cleanup

* cleaned up weird unused meta files

* add new wall jump nn files and rename a prefab

* walker change stacked states from 5 to 1

walker collects physics observations so stacked states are not needed

* fixed reacher platform and crawlerstatic scene

* add more space between agents

* adjust x pos of camera based on new agent spacing

* adjust colliders & testing new nn models

* change speed on hallway agent and make rb continousDynamic

also update goal collider size in pushblock

* pushblock add new model, crawler decrease spawn radius

* reset cube pos each agent reset

* added new hallway nn model, fixed goal gameobjects

* add new files for 3dball

* added new models

* fixed crawlerStatic target spawn

* Increase bouncer steps

* [format] Format code to be complaint with Unity coding conventions. (#2608)

* Revert Batcher changes

Author: Hunter-Unity

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