Allow to re-order table rows not only list items

[lex0r]

At the moment only ol > li HTML structure is supported if one needs to implement reordering of sortable items. Having support for tbody > tr structure would came at a minimum cost of changes and is nearly supported by underlying code. I guess I don't need to prove that it's rather typical to sort tabular data and doing so shouldn't require developers to go for a completely new sort implementation on the FE.

I will share a PR here for a sample implementation.

[lex0r]

#1041