refactor(analytics): move all analytics files to a new Libraries/Analytics folder

Dockerfile

app/Config/Analytics.php

app/Config/Autoload.php

app/Config/Routes.php

app/Controllers/Admin/AnalyticsData.php

app/Controllers/Episode.php

app/Controllers/Install.php

app/Controllers/Podcast.php

app/Database/Seeds/FakePodcastsAnalyticsSeeder.php

app/Database/Seeds/FakeWebsiteAnalyticsSeeder.php

app/Entities/Episode.php

app/Helpers/analytics_helper.php

app/Helpers/url_helper.php

app/Libraries/Analytics/Config/Analytics.php

app/Libraries/Analytics/Config/Routes.php

app/Libraries/Analytics/Controllers/AnalyticsController.php

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

...ies/Analytics/Controllers/UnknownUserAgentsController.php

...e/Migrations/2017-12-01-120000_add_analytics_podcasts.php

...s/2017-12-01-130000_add_analytics_podcasts_by_episode.php