Include season actors in episode actors

We don't have season actors, only show actors or episode actors
So merge tmdb's season actors into episode actors

src/com/archos/mediascraper/themoviedb3/ShowIdEpisodes.java

@@ -83,6 +83,8 @@ public static Map<String, EpisodeTags> getEpisodes(int showId, List<TvEpisode> t
                 if (tvSeasons != null) {
                     tvSeason = tvSeasons.get(tvEpisode.season_number);
                     if (tvSeason != null) {
+                        for (CastMember seasonStar : tvSeason.credits.cast)
+                            episodeTags.addActorIfAbsent(seasonStar.name, seasonStar.character);
                         // note tvSeason.poster_path can be null when show has only one serie e.g. https://api.themoviedb.org/3/tv/93911/season/1?language=en&api_key=051012651ba326cf5b1e2f482342eaa2
                         if (tvSeason.poster_path != null) {
                             episodeTags.addDefaultPoster(ShowIdImagesParser.genPoster(showTags.getTitle(), tvSeason.poster_path, language, false, context));