Backport some improvements from branch 'kick-support'#915

Merged

ScrubN merged 9 commits intolay295:masterfrom ScrubN:backport-some-kick-support-stuff

Dec 15, 2023

+1,644-234

Commits on Dec 15, 2023

Backport M3U8 parser and ReadOnlySpanExtensions: Count, UnEscapedIndexOf, and UnEscapedIndexOfAny & related tests
ScrubN
committed
Implement M3U8 parser
ScrubN
committed