Adds the ability to go to the latest threadmark or a specific threadmark of a thread by adding `/latest` / `/ltst` (`/ltst/` is required for QQ) or `/nav/{NUMBER}` respectively to the end of a URL to a SV/SB/QQ thread with threadmarks. The `/latest` or `/nav/{NUMBER}` must be added before the anchor (the # symbol). e.g. https://forums.sufficientvelocity.com/threads/{THREAD_ID}/latest, https://forums.spacebattles.com/threads/{THREAD_ID}/page-268/nav/2, https://forum.questionablequesting.com/threa
