VCFReader enhanced

*INFO selector is alphabetically ordered.
*Text into cells are easier to select, they are always available to select and a simple click selects the whole cell.
*Index column has different background.
*Filters have show/hide button: enable or disable the filter.
*Filters have allow/disallow voids: ¿filter variants if they do not contain the selected tag?
*INFO table is also easy to select.

*TSVReader gets also the index column and the easy selection features.

TODO: add the view/noview button to tsvreader