Prepare ddpg algorithm

Nicola Gattorequested to merge
prepare-ddpg-algo into master
  • Update the version to 0.3.1-SNAPSHOT
  • Prepares configuration symbol and parameters for different rl algorithm:
    • Add reinforcement learning algorithm parameter to switch between dqn and ddpg
    • Add parameter for critic network
    • Annotate configuration symbol with information about the trained NN architecture

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