Include Aria recommendations in the Problems panel

[ben]

It's probably my doing again, but I do not see a recommendation, or otherwise, for a non-existent aria label(s) for the progress bar.

This is what Bootstrap advises:

<div class="progress" role="progressbar" aria-label="Basic example" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100">
  <div class="progress-bar" style="width: 0%"></div>
</div>

[George]

We haven’t included aria checks and recommendations yet as we don’t have properties inspectors to edit those visually yet.

So we will be adding them both.