Release 161 - Text improvements for books, signs and text tools

Text improvements for books, signs and text tools

First update for the year, focusing on text improvements for the text editor tools.

Added text editor hoverEvent options for show text, show item and show entity. Added clickEvent to change page in books. Insert special character option. And also fixed a few bugs.

The next few updates will focus on getting the new item generator to replace the existing give generator. This will be a big update, and it's not going to be rushed. I will be working on this for the next few months, so expect a few more minor updates before the big one.