Feature Request: Better management of favorites

[MrDowntempo]

Since this extension relies on different frontends being up and up to date, occasionally one will either stop working because it got taken down or the original site has changed its format which broke the front end. This can be resolved often by just changing servers. However, while LibRedirect lets you set multiple servers as a favorite, you can't prioritize them, or set one as a favorite but lower its priority because its broken when another one is working. Ideally I'd like to set multiple favorites, and put them in order (with some buttons to raise and lower their order) and if a site 404s, libredirect could just try the next one. If its a more subtle error, some buttons on the main extension to witch to the next server in line.