feat: add support for Vala, QML, Haxe, Wikitext, Soy, and their related languages

[kisaragi-hiu]

Yet again, I bundled multiple languages into one PR because I think this should, hopefully, be easier to review.

The full list is:

• Vala, Genie (Vala's indentation-based but neglected cousin)
• QML, qmldir, QSS (Qt style sheets)
  • Of note, while QSS is almost just like CSS, the fact that it has a different vocabulary means it's much better highlighted with its own grammar definition.
• Haxe, HXML
  • Despite the name, HXML is not Haxe's XML variant, but a format for storing Haxe compiler arguments. And yet despite that, it's used widely enough that it was added to GitHub's language support, so adding it is still justified.
• Wikitext, via Frederisk/Wikitext-VSCode-Extension. Wikitext is also supported on GitHub.
• Soy (Google Closure Templates), via mthadley/language-closure-templates.
  • There is another syntax, Medium/soy-sublime/, but it's more outdated than mthadley/language-closure-templates.
  • mthadley/language-closure-templates is also used by GitHub Linguist to highlight .soy files.

Adding support for Soy / Closure Templates closes #47.

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[antfu]

Can you help resolve the conflicts? Thanks

[kisaragi-hiu]

I've pushed the rebased result again; they should also still be sorted correctly.