* GameTicker turned into an EntitySystem
* Turns ClientGameTicker into an EntitySystem, turn NetMessages into events
* Change event names to be more consistent with the rest.
* YAML linter uses the dummy gameticker CVar override.
* Fix game ticker initialization order
* Dummy ticker won't spawn players.
* Fix character creation test
* Make ghost component ECS
* Remove players and locations properties from ghost component
* Address reviews
* One more doc
* Fix client ghost component state method error