28: Check when, on FileDialogs, the user press cancel instead of accept 

Task-Url: https://github.com/lomagno2003/codemapper/issues/issue/28
30: Block the "Atras" button on the finish page of wizard 

Task-Url: https://github.com/lomagno2003/codemapper/issues/issue/30
22: Configure file filters on FileDialogs 

Task-Url: https://github.com/lomagno2003/codemapper/issues/issue/22
5: Make a Integration Test with the sheets provided by the commerce 

Task-Url: https://github.com/lomagno2003/codemapper/issues/issue/5