Change logic season pack

Check if season is ended before using season pack for whole season
Check if season ended > 7 days ago, before using season pack as torrent fall back for single episodes
Fix BTN adding same search parameters multiple times
Add extension filter to associated files for Post Processing

Allow the user to filter the associated files, that way it only moves
what the user wants (just subs for example).
This is useful for those that dont know how or have the ability to setup
a cleanup script in their downloader or have to maintain that list.

+ Move function to helpers
Merge branch 'change_logic_complete_season_results' into development

* change_logic_complete_season_results:
  Change logic season pack
Merge branch 'fix_BTN_duplicate_search_params' into development

* fix_BTN_duplicate_search_params:
  Fix BTN adding same search parameters multiple times
Merge branch 'PR-845_PP_filter_extensions' into development

* PR-845_PP_filter_extensions: closes gh-845
  Add extension filter to associated files for Post Processing