Episode Status Management tweaks

* Add 'expand all shows' button
* Add 'toggle all' button
* Add **Unknown** status to be queried (useful to find episodes that belong to a show with invalid location)
* Add options to filter out inital data set (by default the same data is returned as before, just now users have the option to fine tune)
  * Include specials (season0) - before we always excluded
  * Exclude episodes without airdate 'never' - before we always included