Faster strings for passing messages to threads or using in WebGL

[trusktr]

When it comes time to manipulate strings and pass them to workers via Transferables for performance and/or manipulating strings for rendering in WebGL, things like the following might be handy:

• https://www.npmjs.com/package/stringview
• https://developer.mozilla.org/en-US/Add-ons/Code_snippets/StringView
• …