Add support for custom subtitle styling when using torrents.

[Ykuzhe]

Feature Summary

Just like the title said, with the new release adding support for HEVC codecs (which a lot of torrent uses), not being able to see the cool and beautiful subtitles that are provided in those torrents is a shame so being able to add support to this would make the app really perfect.

Detailed Description

Current Behavior

Without the support for this, most subtitles (especially OP/ED subs) becomes quite boring and worst case scenario, even break.

Proposed Solution

While I don't know how this could really work since I'm not really a programmer or anything like that, you could probably do it how just like most media players do it (i.e VLC and mpv). There are even others open-source anime-focused torrent streaming app that I'm pretty sure also uses Exoplayer like Dantotsu does so there's that!

Considerations

I'm not really sure for this part, sorry.

Additional Context

Here's some video examples (sorry for the shitty editing lol), this showcases how the default subtitles that torrents uses (marked by the red logo of a particular app uses, won't really mention cause I'm afraid I'll break some rule) and how those subtitles are displayed inside Dantotsu. First video just showcases the subtitles of the Death Note 2nd opening while the other video showcases just how bothering it can be if this feature is not supported anytime soon.
https://files.catbox.moe/xt06lq.mp4
https://files.catbox.moe/qk8q21.mp4

(P.S. Seems like there's a bug also, whenever you wanna play an episode (especially the first episode it seems) but you've already finish that episode all the way through it will show you a toast saying Player Error 1000, I don't know if I can copy toasts messages so all I got is a screenshot, sorry. Anyway here it is. Thanks in advance!

Submission Checklist

• I have searched the existing issues and confirm that this feature has not been requested before.
• I have provided a clear and descriptive title.
• I am using the latest version of Dantotsu. If not, I have provided a reason for using an older version.
• I understand that not all feature requests will be accepted, and if declined, I won't resubmit the same request.

[github-actions]

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