convert project picker to pure jquery

[vladak]

When the project picker is being loaded, the classical select is displayed first, to be rewritten by the jquery version shortly afterwards. This creates a visual blip which is a bit disturbing. Given most of the pages require JS anyway, maybe converting it to pure jquery would be in order.

[tulinkry]

After #1535 is merged consider using pure javascript for this picker as well. However there shouldn't be the ugly jump as the number of values in this picker is rather small (and does not change in any deployment)