Added C++ agent
As a result, found an issue where qchess was printing "-1" as the index whenever a King was selected. I don't know why that didn't break the python agent, but it definitely breaks the C++ agent, so I fixed it.
agents/agent++/Makefile
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agents/agent++/agent.cpp
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agents/agent++/agent.h
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agents/agent++/main.cpp
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agents/agent++/qchess.cpp
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agents/agent++/qchess.h
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