fix problem with zombified player always spawning (issue #11)
- port to 1.21.5 for NeoForge
- port to 1.21.5 for Fabric
- fix issue with inventory of zombified player not being saved correctly
- make zombified player immune to lava and fire (issue #6)
- make zombified player immune to lava and fire (issue #6)
- remove option for spwan after death by infection
