Integrate network of deterministic actor, critic, and DQN

[kan-s0]

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• Integrate overlapping actor and critic networks, and rename and relocate them together with DQN networks with similar functions.

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• add to network.policy.py:

  • Actor -> DeterministicPolicy

• create network.q_network.py:

  • Critic -> DiscreteQ_Network
  • DQN -> ContinuousQ_Network

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