Add RGB staff (#13125)

Content.Server/Magic/Events/ChangeComponentsSpellEvent.cs

@@ -0,0 +1,21 @@
+using Content.Shared.Actions;
+using Robust.Shared.Prototypes;
+
+namespace Content.Server.Magic.Events;
+
+/// <summary>
+///     Spell that uses the magic of ECS to add & remove components. Components are first removed, then added.
+/// </summary>
+public sealed class ChangeComponentsSpellEvent : EntityTargetActionEvent
+{
+    // TODO allow it to set component data-fields?
+    // for now a Hackish way to do that is to remove & add, but that doesn't allow you to selectively set specific data fields.
+
+    [DataField("toAdd")]
+    [AlwaysPushInheritance]
+    public EntityPrototype.ComponentRegistry ToAdd = new();
+
+    [DataField("toRemove")]
+    [AlwaysPushInheritance]
+    public HashSet<string> ToRemove = new();
+}