Added support to set the cell color to the setCellProperties method.
trying to get the compiled version of filter arrow removed.
Added methods to remove filter arrows and force auto fit columns
Added a SetCellProperties method as a catch all for performing multiple changes to cell properties like font, font size etc.
Added some methods to delete columns and a method to change the format of a number/date cell.
small changes
A library for easier updating of Excel spreadsheets
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