Support for HTML files

[Haprog]

Add support for HTML files.

It would be nice if the html template literal was syntax highlighted also within a script in an HTML file (like in HTML imports of Polymer 2 components).

For example:

...
<script>
const foo = html`<p class="bar">foo</p>`;
</script>

[Haprog]

Maybe I can somehow manually enable this in HTML file context by configuring VS Code? Can I?

[Haprog]

Maybe you could add a configuration option so that this can be manually enabled for other filetypes? Maybe something similar to how you can specify extra filetypes for Emmet support using a configuration option called emmet.includeLanguages: https://code.visualstudio.com/docs/editor/emmet#_emmet-abbreviations-in-other-file-types

[pushqrdx]

@Haprog sorry for the delayed response, github didn't notify me for some reason. I'll look into that asap. Embedding languages in vscode isn't that well documented, though for this one i don't think it would take much effort.