Cargo: pizza & bureaucracy (#5123)

* add paper label component

* git mv

* rename namespace

* add cargo printouts

* more crates

* directly attach paper

* comment typo

Content.Shared/Labels/LabelEvents.cs

@@ -0,0 +1,47 @@
+using System;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Labels
+{
+    /// <summary>
+    /// Key representing which <see cref="BoundUserInterface"/> is currently open.
+    /// Useful when there are multiple UI for an object. Here it's future-proofing only.
+    /// </summary>
+    [Serializable, NetSerializable]
+    public enum HandLabelerUiKey
+    {
+        Key,
+    }
+
+    [Serializable, NetSerializable]
+    public enum PaperLabelVisuals
+    {
+        HasLabel,
+    }
+
+    /// <summary>
+    /// Represents a <see cref="HandLabelerComponent"/> state that can be sent to the client
+    /// </summary>
+    [Serializable, NetSerializable]
+    public class HandLabelerBoundUserInterfaceState : BoundUserInterfaceState
+    {
+        public string CurrentLabel { get; }
+
+        public HandLabelerBoundUserInterfaceState(string currentLabel)
+        {
+            CurrentLabel = currentLabel;
+        }
+    }
+
+    [Serializable, NetSerializable]
+    public class HandLabelerLabelChangedMessage : BoundUserInterfaceMessage
+    {
+        public string Label { get; }
+
+        public HandLabelerLabelChangedMessage(string label)
+        {
+            Label = label;
+        }
+    }
+}