Proper interplanetary launch

core/src/mindustry/content/TechTree.java

@@ -1,6 +1,7 @@
 package mindustry.content;
 
 import arc.*;
+import arc.func.*;
 import arc.scene.style.*;
 import arc.struct.*;
 import arc.util.*;
@@ -140,6 +141,14 @@ public class TechTree{
             all.add(this);
         }
 
+        /** Recursively iterates through everything that is a child of this node. Includes itself. */
+        public void each(Cons<TechNode> consumer){
+            consumer.get(this);
+            for(var child : children){
+                child.each(consumer);
+            }
+        }
+
         public Drawable icon(){
             return icon == null ? new TextureRegionDrawable(content.uiIcon) : icon;
         }