now with basic debug rendering and hivemind python example

added basic debug rendering:

• 3D polylines and 2D text
• automatically vanishes when the bot that issued the command disconnects
• see https://github.com/samuelpmish/RLBot/wiki/JSON-Message-Specification for specifics

added hivemind example bot in python

• highlights how to declare that a process wants to control more than 1 bot
• shows how to issue controls to each different car it controls
• added additional config file showing how num_cars must be large enough to support the bot's multiplicity