DI-drive (beta) v0.1.2

• Rename 'orientation' to 'forward_vector'
• Redefine train, test, and eval in demo
• Move 'utils' in simple rl into core
• Add Latent RL demo, including env, DQN train, test and eval
• Add MPC controller with waypoints input
• Add AutoMPCPolicy, rename AutoPolicy to AutoPIDPolicy
• Add Vanilla VAE model
• Add API doc for MPC controller
• Add API doc for LPC Policy
• Update evaluator. It now returns success / success rate
• Fix a bug that walker controller may be identified as walker in CarlaDataProvider
• Fix birdview visualizer to show less channels