Adds false alarm and updates events code (#2577)

* oops accedentaly ports how ss13 deals with event randomness. Also renames FakeEvent to FalseAlarm!

* thing

* greytide but it's implemented badly

* fixes&changies, also greytide!

* rng actualy exists now

* resync

* Naming Schemes

* Startup not init

* areas are dead

* very cool vsudio

* this does not exist, wtf

* Cleanup

* Nullables, fixables, and timings

Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>

Content.Server/StationEvents/FalseAlarm.cs

@@ -0,0 +1,30 @@
+#nullable enable
+using JetBrains.Annotations;
+using Content.Server.GameObjects.EntitySystems.StationEvents;
+using Robust.Shared.GameObjects.Systems;
+
+namespace Content.Server.StationEvents
+{
+    [UsedImplicitly]
+    public sealed class FalseAlarm : StationEvent
+    {
+        public override string Name => "FalseAlarm";
+        public override float Weight => WeightHigh;
+        protected override float EndAfter => 1.0f;
+        public override int? MaxOccurrences => 5;
+
+        public override void Announce()
+        {
+            var stationEventSystem = EntitySystem.Get<StationEventSystem>();
+            var randomEvent = stationEventSystem.PickRandomEvent();
+
+            if (randomEvent != null)
+            {
+                StartAnnouncement = randomEvent.StartAnnouncement;
+                StartAudio = randomEvent.StartAudio;
+            }
+
+            base.Announce();
+        }
+    }
+}