Export visible columns in spreadsheet
This MR add a feature to filter columns when exporting scene in a Spreadsheet.
It also includes the following :
- Visibility fix for columns in Spreadsheet
- Always AutoResize to contents in spreadsheet
- Sanity check and enabled state fix for pqExportReaction
- ExportSpreadsheet toolButton in spreadsheet view
- New property in vtkCSVExporter to enable/disable this feature when exporting, it shows up in a dialog
- ColumnVisibility propoerty in vtkSpreadsheetView suposed to be used only when exporting but could be used in other context as well
- trailing whitespace fix
replace !918 (closed) fix #16798 (closed)