Deleted convlab/dialcrowd_server/agents/base_agent.py,...

Deleted convlab/dialcrowd_server/agents/base_agent.py, convlab/dialcrowd_server/agents/ddpt_agent.cfg, convlab/dialcrowd_server/agents/ddpt_agent.py, convlab/dialcrowd_server/AgentFactory.py, convlab/dialcrowd_server/DialcrowdTaskGen.py, convlab/dialcrowd_server/DialogueServer.py, convlab/dialcrowd_server/Goal.py, convlab/dialcrowd_server/SubjectiveFeedbackManager.py, convlab/dialcrowd_server/__init__.py