feat: HLS / DASH support forced subtitle #451

Job	Run time
Settings / settings	2s
Lint / Lint	14s
Test Linux distros / Matrix configuration	10s
Official Docker image / Build	13m 57s
Build docs / Build docs	34s
Build and test / Matrix configuration	7s
Test Linux distros / Alpine	14m 7s
Test Linux distros / ArchLinux	11m 7s
Test Linux distros / CentOS	10m 9s
Test Linux distros / Debian	15m 17s
Test Linux distros / Fedora	9m 57s
Test Linux distros / OpenSUSE	10m 43s
Test Linux distros / Ubuntu	9m 44s
Build and test / linux x64 Debug static	10m 42s
Build and test / linux x64 Debug shared	10m 42s
Build and test / linux x64 Release static	10m 29s
Build and test / linux x64 Release shared	10m 10s
Build and test / osx x64 Debug static	11m 16s
Build and test / osx x64 Debug shared	14m 32s
Build and test / osx x64 Release static	17m 23s
Build and test / osx x64 Release shared	19m 39s
Build and test / win x64 Debug static	16m 34s
Build and test / win x64 Debug shared	14m 17s
Build and test / win x64 Release static	18m 0s
Build and test / win x64 Release shared	18m 37s
Build and test / linux arm64 Debug static	10m 36s
Build and test / linux arm64 Debug shared	10m 28s
Build and test / linux arm64 Release static	10m 31s
Build and test / linux arm64 Release shared	11m 45s
	5h 11m 49s

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