Add tooltips to chiselled bookshelves and shelves

It's rather inconvenient having to get items down in order to see their titles or details.

Also colour variations among the shelved books to reflect what type of book they are would be good, appearing one colour when they are just books, another for book-and-quills, another signed books, another for enchanted books.

With shelves, it would also make it a lot easier to see which item is in focus, and how many are in the stack.