Dev v2.0.0b0

[beyretb]

v2.0.0b0 (beta)

• Bump ml-agents from 0.7 to 0.15 which:
  • allows multiple parallel environments for training
  • adds Soft actor critic (SAC) trainer
  • has a new kind of actions/observations loop (on demand decisions)
  • removes brains and some protobufs
  • adds side-channels to replace some protobufs
  • refactoring of the codebase
• GoodGoalMulti are now yellow with the same texture (light emitting) as GoodGoal and BadGoal
• The whole project including the Unity source is now available on our ml-agents fork