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/ComponentConstructionGraphStep.cs

@@ -0,0 +1,38 @@
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Localization;
+using Robust.Shared.Serialization;
+using Robust.Shared.Utility;
+
+namespace Content.Shared.Construction
+{
+    public class ComponentConstructionGraphStep : ArbitraryInsertConstructionGraphStep
+    {
+        public string Component { get; private set; }
+
+        public override void ExposeData(ObjectSerializer serializer)
+        {
+            base.ExposeData(serializer);
+
+            serializer.DataField(this, x => x.Component, "component", string.Empty);
+
+        }
+
+        public override bool EntityValid(IEntity entity)
+        {
+            foreach (var component in entity.GetAllComponents())
+            {
+                if (component.Name == Component)
+                    return true;
+            }
+
+            return false;
+        }
+
+        public override void DoExamine(FormattedMessage message, bool inDetailsRange)
+        {
+            message.AddMarkup(string.IsNullOrEmpty(Name)
+                ? Loc.GetString("Next, insert an entity with a {0} component.", Component) // Terrible.
+                : Loc.GetString("Next, insert {0}", Name));
+        }
+    }
+}