feat: add remote_url alternative for transcript and chapters files

.gitlab-ci.yml

app/Config/Analytics.php

app/Controllers/Admin/Episode.php

app/Controllers/Admin/PodcastImport.php

app/Database/Migrations/2020-05-30-101500_add_podcasts.php

app/Database/Migrations/2020-06-05-170000_add_episodes.php

app/Database/Migrations/2020-12-25-120000_add_persons.php

app/Entities/Episode.php

app/Entities/Person.php

app/Entities/Podcast.php

app/Helpers/id3_helper.php

app/Helpers/media_helper.php

app/Helpers/rss_helper.php

app/Language/en/Common.php

app/Language/en/Episode.php

app/Language/en/Page.php

app/Language/fr/Common.php

app/Language/fr/Episode.php

app/Libraries/Analytics/Config/Analytics.php

...ries/Analytics/Controllers/EpisodeAnalyticsController.php