Fixes a few bugs related to term slugs that were altered by our plugin after they were saved. This especially caused issues for terms with parents. We will simply not touch term slugs anymore until the way terms are saved is fixed in WordPress, see also https://core.trac.wordpress.org/ticket/22293.
Fixes a bug where we would create redirects if nav menu items were edited.
Fixes a bug where redirects to urls with url parameters got appended with a slash.
Fixes a bug where adding a parent to a page would cause the slug of that page to detected by us as non-unique and incremented with a number.
Fixes a bug where the AJAX request for creating redirects in the search console integration was broken for search console issues for which a 4xx redirect already exists.