Preserve QExcell auto filters in XLSX

src/types.ts

@@ -20,6 +20,7 @@ export interface Sheet {
   name: string;
   visibility?: "hidden" | "veryHidden";
   frozenPane?: SheetFrozenPane;
+  autoFilter?: string;
   cells: Record<string, string>;
   mergedCells?: MergedCellRange[];
   hyperlinks?: Record<string, string>;