Adds hand labelers (#4903)

* Adds hand labelers

* Removes unnecessary thing

* Docs

* Reverts some changes

* Addresses comments and adds inhand sprites

* Addressed comments

Co-authored-by: Watermelon914 <3052169-Watermelon914@users.noreply.gitlab.com>

Content.Server/HandLabeler/LabelSystem.cs

@@ -0,0 +1,36 @@
+using Content.Server.HandLabeler.Components;
+using Content.Shared.Examine;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Localization;
+using Robust.Shared.Utility;
+
+namespace Content.Server.HandLabeler
+{
+    /// <summary>
+    /// A system that lets players see the contents of a label on an object.
+    /// </summary>
+    [UsedImplicitly]
+    public class LabelSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeLocalEvent<LabelComponent, ExaminedEvent>(OnExamine);
+        }
+
+        private void OnExamine(EntityUid uid, LabelComponent? label, ExaminedEvent args)
+        {
+            if (!Resolve(uid, ref label))
+                return;
+
+            if (label.CurrentLabel == null)
+                return;
+
+            var message = new FormattedMessage();
+            message.AddText(Loc.GetString("hand-labeler-has-label", ("label", label.CurrentLabel)));
+            args.PushMessage(message);
+        }
+    }
+}