Add basic meteor swarm (#4420)

* Add basic meteor swarm

* Map fixes

* Dependency cache

* Fix projectile crash

* Last of the reviews

Content.Server/StationEvents/StationEventSystem.cs

@@ -175,6 +175,7 @@ namespace Content.Server.StationEvents
                 if (type.IsAbstract) continue;
 
                 var stationEvent = (StationEvent) typeFactory.CreateInstance(type);
+                IoCManager.InjectDependencies(stationEvent);
                 _stationEvents.Add(stationEvent);
             }