change towards pep8 and addressed a number of issues my IDE flagged

[cfd1]

You have done an amazing job. I have addressed alot of my IDE issues and made a step towards PEP8 code.

• I have changed train.py to used argparse defaults instead of checking in the code
• I have moved the AgentPolicy to a new file
• I have made it a little easier to specify the model to load in main.py
• Fixed spawn cart arguments as it was missing cooldown and cargo when compared to spawn worker
• Activated your code to use multiple cores
• Updated the game_constants.json to the v.3.1.0 values
• Fixed a few init() function missing super calls
• Added gym into the setup.py

Keep up the great work. I will hopefully contribute some more useful changes in the future.

[glmcdona]

Thanks for the update, really appreciate it! The function and variable naming were driving me nuts too, I had left them as they originally were from the TypeScript code at the time because it made it easier to translate the code. I'll merge this as soon as I have a little time to give it a quick pass over.