* Implement entity metadata protocol handling
* Add health information for entity
* Make AutoAttack check entity health
* LivingEntity: Default health is 1.0 as per https://wiki.vg/Entity_metadata#Living_Entity
* Fix entity metadata for lower MC versions
* Fix commit 888297d (1.0f instead of 1.0)
* Add OnEntityHealth ChatBot event (Remove protocol-dependant stuff from McClient (undo part of 85c32b9))
* Remove OnEntityMetadata in favor of OnEntityHealth
Co-authored-by: ORelio <ORelio@users.noreply.github.com>