Moiz Merchant

Results 2 issues of Moiz Merchant

Support for webvtt subtitles. Adds the `USP-X-TIMESTAMP-MAP` tag. Allows both reading and writing of the tag. Follows the program timestamp pattern. ``` #EXTM3U #EXT-X-INDEPENDENT-SEGMENTS #EXT-X-MEDIA-SEQUENCE:45457 #EXT-X-VERSION:4 #EXT-X-PROGRAM-DATE-TIME:2021-05-24T23:58:46.170000 #USP-X-TIMESTAMP-MAP:MPEGTS=726546,LOCAL=2021-05-24T23:58:46.170000 #EXTINF:5, /movie/55/subtitle/1/segment/1.vtt...

Added missing if/def for esgl 2.0 during the background shader's transition phase.