SRT subtitle alignment tag support

[LITUATUI]

SRT subtitle alignment is becoming more common. I see them often in Netflix Korean series.

These are the tags used for alignment in SRT files:

Top-right: {\an9} Top-center: {\an8} Top-left: {\an7}

Middle-right: {\an6} Middle-center: {\an5} Middle-left: {\an4}

Bottom-right: {\an3} Bottom-center: {\an2} Bottom-left: {\an1}

Kodi 20 Nexus already supports it.

[felipefgf12]

On the LG TV app is worse 'cause the tags appear on the subtitle. Kindly remembering the devs to look upon this issue 🙏