Admin: Fixtures import

Current season is: 19: 2018-19 season

This importer is to be used in conjunction with the Fixtures YY-YY.xls file (where YY are years). That Excel file is where the fixtures can be created and a CSV file exported for import here.
This importer validates the file before loading to make sure that everything is ok. You need to have created the new season, divisions, teams, clubs etc for the new season fixtures before import.
Everything needed by the fixtures needs to be in place before the import is run.