In support of the migration away from Blazegraph, frontend work is required to integrate the WDQS query UI with the new endpoints.
Incomplete list of likely necessary changes/checks:
* update autocomplete
* update prefixes in prefix menu
* check if the "format query" button still does the right thing
* check if stopping a query still works
* check if reporting of query time and result count works
* check code menu for code snippets for integration with other apps, etc - does it work? does it generate the right code?
* check if downloading of query results works in the various formats
* check if all entries in the "link" submenu of the query result work and are correct
* check if embedded view works (including left and right fly-out menu)
* adapt the visual query editor in the UI (not the Query Builder but the one integrated in the Query UI)
Things to keep in mind while doing this:
* The UI is also used on other Wikibase instances, which will still be running Blazegraph for a while longer.