Suggestions for new version

[Secozzi]

• Filler marking, some sources provides a way to tell if an episode is a filler or not. Would be useful if aniyomi implements a way to filter out fillers (like animiru).
• Default parameter for Track(), that way, a default subtitle / audio track can be set
• The ability to specify different headers for the Track(), since sometimes the video and subtitles can come from two different websites
• The ability to specify container/file type manually. For example, for consumybili the video is a dash file, but the video url doesnt contain .mpd and changing the url to contain .mpd causes server error.