Simple support for WebVTT style

[NhanNguyen700]

Hi all,

Now, we will lose all of WebVTT style after reading it, process somethings and write to WebVTT format again. This PR provide a simple WebVTT style handling, since CSS support many properties, I will not parsing them all, we will just blindly store all the things in STYLE and rewrite them when writing WebVTT again. We will love some spaces and new lines, but it's not a big duel. Besides, when merging subtitles2 into subtitles1, if there are duplicated CSS selectors, only the CSS style of subtitles1 will be kept.

[NhanNguyen700]

Hi @asticode , I added simple support for WebVTT style, could you please take a look?

[asticode]

Let me know when I can review your last changes 👍

[asticode]

Tests seem to be failing, could you fix them? 🤔

Also could you remove cssEndToken and use "}" directly in the condition? Also based on your last comment, that could be a good idea to add a comment in the condition:

if blockName != webvttBlockNameStyle || webVTTStyles == nil ||
    // CSS has ended
    len(webVTTStyles.WebVTTStyles) > 0 || webVTTStyles.WebVTTStyles[len(webVTTStyles.WebVTTStyles)-1] == "}" {

[NhanNguyen700]

Comments added and cssEndToken was removed

[asticode]

Thanks for the PR! ❤️

Let me know whether you need a tag 👍