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

Content.Shared/Sprite/RandomSpriteComponent.cs

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+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Sprite;
+
+[RegisterComponent, NetworkedComponent]
+public sealed class RandomSpriteComponent : Component
+{
+    /// <summary>
+    /// Available colors based on group, parsed layer enum, state, and color.
+    /// Stored as a list so we can have groups of random sprites (e.g. tech_base + tech_flare for holoparasite)
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite), DataField("available")]
+    public List<Dictionary<string, (string State, string? Color)>> Available = new();
+
+    /// <summary>
+    /// Selected colors
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite), DataField("selected")]
+    public Dictionary<string, (string State, Color? Color)> Selected = new();
+}

Content.Shared/Sprite/SharedRandomSpriteSystem.cs

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+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!;
+}