Data-oriented Construction System (#2152)

- Powerful
- Data-oriented
- Approved by PJB
- Powered by node graphs and AI pathfinding
- Coded by the same nerd who brought you atmos

Co-authored-by: Exp <theexp111@gmail.com>

Content.Shared/Construction/ArbitraryInsertConstructionGraphStep.cs

@@ -0,0 +1,19 @@
+using Robust.Shared.Serialization;
+using Robust.Shared.Utility;
+
+namespace Content.Shared.Construction
+{
+    public abstract class ArbitraryInsertConstructionGraphStep : EntityInsertConstructionGraphStep
+    {
+        public string Name { get; private set; }
+        public SpriteSpecifier Icon { get; private set; }
+
+        public override void ExposeData(ObjectSerializer serializer)
+        {
+            base.ExposeData(serializer);
+
+            serializer.DataField(this, x => x.Icon, "icon", SpriteSpecifier.Invalid);
+            serializer.DataField(this, x => x.Name, "name", string.Empty);
+        }
+    }
+}