Carp wave spawner and dragons as an actual event (#10254)

Content.Shared/Sprite/SharedRandomSpriteSystem.cs

@@ -0,0 +1,11 @@
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Sprite;
+
+public abstract class SharedRandomSpriteSystem : EntitySystem {}
+
+[Serializable, NetSerializable]
+public sealed class RandomSpriteColorComponentState : ComponentState
+{
+    public Dictionary<string, (string State, Color? Color)> Selected = default!;
+}