Zombie Mode 𝓡𝓮𝓭𝓾𝔁 (#18199)

* zombie mode redux

* the great zombie changes

* fix this

* 65 down to 50

* empty

* Changes to address stalling

* make zombie nukies no longer nukies

* actually work

Content.Shared/Zombies/ZombieEvents.cs

@@ -6,6 +6,7 @@ namespace Content.Shared.Zombies;
 ///     Event that is broadcast whenever an entity is zombified.
 ///     Used by the zombie gamemode to track total infections.
 /// </summary>
+[ByRefEvent]
 public readonly struct EntityZombifiedEvent
 {
     /// <summary>