Support for .ASS subtitle positioning codes (e.g. \an8, \a8, etc.) for .SRT subtitles

(This is for all clients)

Most of the online subtitle services are now prolifically supplying .SRT subtitle files using .ASS positioning tags (e.g \an8, \a8 to position text on top of screen).

While these are not technically part of the .SRT spec, MANY common players (VLC, SMplayer, etc) support them in .SRT files.

Without this support, there is a good chance that over 50% of subtitle files that users are acquiring using the Plex built-in subtitle grabbing services will display incorrectly. Both showing the code in the subtitle text and blocking other important text on the screen.

This is very detrimental to the viewing experience.