Better Enchanted Books

By Fourmisain:

• update minecraft version, dependencies and gradle build
• fix NullPointerException in method17869Tail due to uninitialized ThreadLocal
• refactor NBTUtils: use streams instead of new ArrayLists, sort() should never throw an Exception
• use WeakHashMap for ItemStack caches
• rename Mixin methods
• add a proper Logger
• update README (do not run gradlew idea!)