Visualize potential

Zero Player Games

Added ability to create and spectate AI-AI games
Added support for loading rllib agents (this required adding human_aware_rl as a dependency in the docker build)

Ability for user to specify via checkbox whether the graphics should display the current state potential
Super useful to me for debugging potential function
Requires computing MLP when option is specified, which causes game creation to take ~1 minute when MLP has to be re-computed (not found in file)
Added new html to indicate status of game loading
Once new layouts are finalized we might want to add pickled planners for the new layouts to Overcooked_ai
When "show potential" is not checked, the app avoids loading the MLP, which reduces load times back to order of 10ths of seconds