REPORT-283:  Consolidate all Excel utilities into a common package and standardize functionality

Remove ExcelSheetHelper and ExcelStyleHelper classes in favor of utility methods on ExcelUtil, and a new ExcelBuilder class in the common package.
REPORT-283:  Consolidate all Excel utilities into a common package and standardize functionality

Remove ExcelSheetHelper and ExcelStyleHelper classes in favor of utility methods on ExcelUtil, and a new ExcelBuilder class in the common package.
REPORT-283:  Consolidate all Excel utilities into a common package and standardize functionality

Addition of unit tests and code changes to get them to pass for Excel functionality