Source NFO downloads (#95)

* Hooked up series directory finding to source metadata runner

* Fixed aired NFO tag for episodes

* Updated MI NFO builder to take in a filepath

* Hooked up NFO generation to the source worker

* Added NFO controls to form

* Improved the way the source metadata worker updates the source

* Consolidated NFO selection options in media profile instead of source

test/pinchflat/yt_dlp/media_collection_test.exs

@@ -97,7 +97,7 @@ defmodule Pinchflat.YtDlp.MediaCollectionTest do
     test "it passes the expected args to the backend runner" do
       expect(YtDlpRunnerMock, :run, fn @channel_url, opts, ot ->
         assert opts == [:simulate, :skip_download, :ignore_no_formats_error, playlist_end: 1]
-        assert ot == "%(.{channel,channel_id,playlist_id,playlist_title})j"
+        assert ot == "%(.{channel,channel_id,playlist_id,playlist_title,filename})j"
 
         {:ok, "{}"}
       end)