Add support for https://tiger.ch (general, news)
It is disabled and inactive by default because it's just a metasearch engine
like SearXNG is, so it's mostly useful for bypassing rate-limits on other
engines: (it has its own German index, but it's not that great) in theory it
supports different locales, but I was too lazy to implement that (I only need
German and English results anyways, which are returned by default...)
Bnyro