Fixed crash when signing the book & crash when deleting page with selected element

Added formatting and a convenient way to edit text! Some features not polished well enough, so it's marked as beta. If something is wrong, you can safely rollback to 2.0.2 and report your issue

Fixed multiplayer sync & illustration frame explosion

Fixed server packet handle exception. Fixed client crash when opening new book. Fixed frame properties.

NEW IN 2.0.0

• Added illustrations! Now you can put your wonderful arts or info into the world! You can create illustration up to 8 by 8 blocks! (Configurable up to 16 in config, may not be supported by old graphics cards)
• Illustrations can be covered with dust. (Configurable in config)
• Font size