Support SRT styling and bold/underline in VTT

[kloon15]

Hows this code looking like? Feedback appreciated.

[asticode]

Could you also fix webvtt tests and add srt/webvtt tests for bold/italic/underline/color?

You can either directly use testdata/example-in.srt in TestSRT for instance, or write a new test specifically for html tags.

[asticode]

Could you remove the SSA-related commits from this PR?

I don't want to mix different things in the same PR.

Thanks

[kloon15]

Could you remove the SSA-related commits from this PR?

I don't want to mix different things in the same PR.

Thanks

I done nothing to SSA, its for supporting SRT position tags which use ASS tags so figured its easier to call em that. TBH im not sure what tags most players support, but position is pretty popular.

[asticode]

I done nothing to SSA, its for supporting SRT position tags which use ASS tags so figured its easier to call em that. TBH im not sure what tags most players support, but position is pretty popular.

OK, then could you remove the 2 commits handling ASS tags from this PR? I'd rather have this change in a separate PR.

Thanks!

[kloon15]

Sure will do that.