Fix menu, add slash command

Also verified every coordinate in-game, and added notes where useful to clarify locations in multi-level structures etc.
Fix removal of books read during session
Hide click hints in minimap tooltips

Apparently HandyNotes icons aren't clickable on the minimap?
Add chat notice about unique books

...when adding waypoints for all books via rightclick menu or /wellready command. Primarily of use for the unique books in Scholomance and Stratholme, since those waypoints won't appear on continent maps.