Statistic Books

• fixed refresh type "Global Timer" (id: 3) not sorting scores properly. This was an oversight that is now fixed, they should all be sorted now.

Funny story, turns out I planned to do some optimization on that, so I put in an additional check to prevent it from sorting every tracked score as many times as they were shown in books. I just never implemented the optimized sorting (once for every tracked scoreboard), a mistake I've now corrected thanks to this bug report.

• fixed "Tried to load invalid item:" error that could occasionally pop up if an empty lectern tried to update the book inside of it.
• in rare occasions a book could be empty after creation without the placeholder message inside. That should be fixed now.