Ollivanders versions 2.3.* are for servers on the 1.13 API

Fixes ported back from 2.5:
- NPE check in Book creation
- NOX and LIBERACORPUS was affecting the caster, not the target
- < 0 protection for setting scores and stationary spell duration and radius

Alpha:
This is alpha because we have only tested these fixes with version 2.5 on the 1.15 API

If you find issues, please let us know via github using the "Ask questions/Get support" button in the right nav.