This update includes a dependency update to version 2 of PopperJS, the library we use for tool-tips. Hopefully this fixes flickering issues with tool-tips. Some tool-tips may have issues after the update. If something doesn't look right, please ask.
* Fixed: Chat lines not showing replies.
* API Fixed: `setChildren` now supports variables that are not `Node`s or `string`s, and does so by casting other types to `string`s. Makes it easy to include numbers and other variables when using JSX.
* Maintenance: Update to PopperJS v2.
* Start using the [pnpm](https://pnpm.io/) package manager rather than npm.
* Replace `node-sass` with `sass`.
* Update versions of many dependencies
* Didn't yet update webpack to v5, since that'll be a mess.
* Clean some old build scripts out of package.json
* Added: `npm run font` command for editing the Fontello icon font. Use it to get started, then start the development server with `npm start` and changes will automatically save when you click `Export Font` from Fontello.
* Changed: The list of Fontello icons is now extracted from our Fontello config file so that it doesn't have to be manually updated.
* Update to version 4 of webpack.
* For that matter, update *every dependency* to the latest available version.
* Remove the babel build target for Edge, as it doesn't seem to be necessary with webpack 4 and tenser.
* Add support for optional chaining and nullish coalescing via Babel transformations.
* Update the clips domain version to work better. Or at all, really.
* Remove unused code from i18n.
* Remove the last `<style>` from vue component files. They don't work that way now anyways.
* Fix a bug in Raven's report handler.
* Fix a bug with the menu button in browsers that don't understand `:scope` within `querySelector()`.
* Fixed: Twitch emotes not displaying in Whispers.
* Fixed: Alignment of in-line actions when using Emote Alignment: Padded.
* Changed: Display the git commit hash for the current build in the FFZ Control Center, rather than the webpack build hash.
