Add "params" property as a way to pass extra arguments to Formatters

Author: Ghislain Beaulac

src/app/modules/angular-slickgrid/models/column.interface.ts

@@ -39,6 +39,7 @@ export interface Column {
   onCellChange?: (args: OnEventArgs) => void;
   onCellClick?: (args: OnEventArgs) => void;
   outputType?: FieldType;
+  params?: any;
   previousWidth?: number;
   resizable?: boolean;
   rerenderOnResize?: boolean;