* Moves all atmos logic from TileAtmosphere to AtmosphereSystem.
* Atmos uses grid anchoring to check for firelocks instead of grid tile lookups.
* CVar for space wind sound
* CVar for explosive depressurization
* 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
