feature export excel add an alternative template parameter , schema tab add Property row a PIVOT column of CustomProperties as Key (column header) Value (cell)

[dmaresma]

Allow the datacontract-cli to customize the excel template to use as :
datacontract export excel --output datacontract.xlsx datacontract.yaml --template https:\\www.github.com\company\odcs.alternative.excel.template.xlsx

and add column header and value from the Pivot of Properties customProperties