Make probesize and analyzeduration configurable and simplify circular

dependencies

Makes the probesize and analyzeduration configurable with env args.
(`JELLYFIN_FFmpeg_probesize` and `FFmpeg_analyzeduration`)

MediaBrowser.MediaEncoding/Subtitles/TtmlWriter.cs

@@ -49,12 +49,5 @@ namespace MediaBrowser.MediaEncoding.Subtitles
                 writer.WriteLine("</tt>");
             }
         }
-
-        private string FormatTime(long ticks)
-        {
-            var time = TimeSpan.FromTicks(ticks);
-
-            return string.Format(@"{0:hh\:mm\:ss\,fff}", time);
-        }
     }
 }