moved coreScore code out of SANA to measures/CoreScore file

[shu-g]

• Added comment in Report.hpp explaining the purpose of CoreScore code.
• Encapsulated all CoreScore data and function in the class CoreScoreData.
• Tried to move out code from SANA.cpp to measures/CoreScore.cpp.
• Corrected TrimCoreScores() to trimCoreScores(), removed circular include. Please let me know in case of other issues, or better design ideas.