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
  * Include specials (season0) - before we always excluded
  * Exclude episodes without airdate 'never' - before we always included
Merge pull request #871 from thezoggy/dev--esm_update

Episode Status Management tweaks