[Feature Request] Support Data Filters #421

In Excel, under the Data ribbon, there is a Sort & Filter section. We would like to open the Excel Spreadsheet and read the rows that show up when a filter is applied. Similarly, we would like the sort order respected (although if that is too complicated we can work around it).

For XLSX pages, there is a section in the sheet.xml that describes the filter applied:

<autoFilter ref="A1:D6">
    <filterColumn colId="2">
        <filters>
            <filter val="3"/>
        </filters>
    </filterColumn>
</autoFilter>

That can help when we are parsing test data and we just want to handle subsets.