…#1811)

* Changed series forget to support seasons as well

* Correctly sort show entities

* Fixed series forget cli

* Added log message when looking for season pack using tvdb

* Removed the pointless is_season_pack property

* Added ability to send multiple entities for delete/forget

* Catch LookupError as well

* Forget downloaded season packs

* Fixed series show sort

* Added logic to emit next episode without series begin

* Added logic to next_series_seasons

* Fixed next_series_logic

* Fixed crash with series begin and series show

* Fixed wrong assignment

* Removed redundant has_history

* Unit tests

Moving tests that @jawilson provided in #1794, plus additional.

* Fix tests

* Really fix tests

The tests involving series.begin will still fail until that issue is
resolved in the actual plugins in a separate commit.

* Check series.begin earlier

Resolves an issue where a season prior to series.begin could be
processed before the break check is reached

* Set low_season to series.begin

* Final location of series.begin check

Probably

* latest_season cannot be lower than series.begin

* Only change low_season if series.begin.season > 1

* Finally fix tests; parametrize new tests

* Resolve issues with series.begin

- low_season has to be 1 lower than the actual last season to test for
range() to work correctly
- Only try to check if begin season is completed while evaluating the
begin season (otherwise, with gaps in history, it will only ever emit
the begin episode)

* Additional tests

- Gaps between season packs
- from_start enabled

* Resolve issues with series.begin (ns_seasons)

- low_season has to be 1 lower than the actual last season to test for
range() to work correctly
- Only try to check if begin season is completed while evaluating the
begin season (otherwise, with gaps in history, it will only ever emit
the begin episode)

* Additional tests (seasons)

- Gaps between season packs
- from_start enabled