Py4j Deprecation

At one point we used a technology called py4j to help us start up java bots. It turned out to be overkill, and we've gotten rid of it. If you have a very old Java bot, you may have gotten an error message asking you to migrate, here's how:

• Make your python file extend ExecutableWithSocketAgent as seen in this commit.
• Make your SamplePythonInterface extend SocketServer as seen in that same commit.
• Go in your build.gradle file and change the proper line to compile 'org.rlbot.commons:framework:2.+' like this: https://github.com/RLBot/RLBotJavaExample/blob/9b4c363dff8bc0b130f82b914c76adbed7c56a3b/build.gradle#L22