Draft: read cluster corrections from ParamFiles

Instead of reading the Calo cluster corrections from the Conditions DB, read the values from a json file in ParamFiles.

Although the Cluster covariance values and E S L correction parameters are read from ParamFiles, I don't know how to remove the ConditionAccessorHolder from CaloCorrectionBase.cpp and ClusterCovarianceMatrixTool.cpp without breaking the code.