tableData changes if sorted/filtered

#923 fixes the issue of data going missing when sorting etc. however it now appears to change from an array of arrays to an array of objects:

https://codesandbox.io/embed/muidatatables-custom-toolbar-txw6d

(added a couple of 'bugged' examples to give you an idea what I was achieving before)

The reason having the original index was so useful was I could enrich the table with extra data that I don't necessarily want to display in the table ie add tooltips or a link etc.

If you click sort now you will see that I have added a link but as its the data order and rowIndex don't match the link always stays on the first row. I don't expect the index to make an appearance where it was but it would be useful it it was returned somewhere.