The performance of the page is heavily degraded by components loaded
dynamically via defineAsyncComponent that recursively carry behind the
whole Vue machinery.
By wrapping defineAsyncComponent calls in shallowRef we make sure that
we only wire the root level of the newly created dynamic component.
Renamed to `notifyWarning` and `notifyError` respectively.
Those names can often clash with other properties defined on components
that extend the mixin (like entities).
The UI is now much faster, the build process completes within one minute
(it used to take >15 minutes), and the size of the bundles has been
reduced by ~70%.