Media player enhancements

[demonff1]

Hey guys, love what ur doing. Infact I can't shut my mouth of requesting some features. These are some of the tweaks I would like to see.

#I loved the interface and ur external player. Could u make the app media player to play videos saved locally in the phone. The UI is great and it's a shame we users can't use it as a video player.
#And the second thing I want is custom subtitles. We can upload locally saved srt files to be used as cc.
It would be a neat feature I think. If u can't make the video player possible atleast make it possible for vids downloaded through newpipe.

[Stypox]

Please follow the issue template when creating an issue, don't just delete everything! You posted two things inside one issue, which makes everything more difficult to track. You didn't explain why those features would be useful. Both feature requests have already been requested.

1. [FR][Multiservice] play local files #1052 and Ability to play downloaded videos #478
2. custom subtitles (and lyrics) support #2902