When selecting select2 shows the "loading.." state for a short time there
which shifts down the result list and makes the selection select the wrong
item.

Work around that by hiding the loading indicator after fetching the data is done
and allow it again once something is selected.

sometimes the update happens during connectedCallback already
and there we need jquery

Properly disconnect from the event

Add a scope so we don't have to care about naming conflicts
and set the verison to 0.1.0 since we don't have a stable API yet.