Let skip*IfExpression importer options to use raw import data
The skipIfExpression and skipRowIfExpression options use row data that reflects rewrites performed by replacement values and applyRegularExpressions. Usually one wants to base their expressions on the original, unmodified import data. We should make the default to use raw data and provide an option to use rewritten data as needed.
Switched behavior of expression options to use raw data. Added useRawValuesWhenTestingExpression option with default of true.