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.Server/Zombies/IncurableZombieComponent.cs

@@ -0,0 +1,10 @@
+namespace Content.Server.Zombies;
+
+/// <summary>
+/// This is used for a zombie that cannot be cured by any methods.
+/// </summary>
+[RegisterComponent]
+public sealed class IncurableZombieComponent : Component
+{
+
+}