UI: Integrate filters (search, repo, state) into the URL

[dixneuf19]

The current search and filter feature does not modify the URL in the browser. It means that is impossible to search a specific view the Burrito UI for someone else.

This kind of feature would be very useful for

• documentation in a repository: give a link with the filter repository already set correctly
• have one link to find all layers in errors
• share a list of layers to someone else, for debug