The UI kit of shared Discourse components, helpers, and modifiers

[NateDhaliwal]

@system

DAsyncContent Render content that is loaded asynchronously. Give it a promise, a TrackedAsyncData, or a function that fetches the data via @asyncData, and fill the loading, content, empty, and error blocks; it reloads when @context changes, so there is no need to hand-roll loading flags and error handling.

This looks super promising. No need for a tracked loading var with a spinner anymore! Perhaps it’s time to update some components now.