Hide Items on Planets Field (#7550)

* Hide item on planet field

* Better name, Planet[] instead of String[]

* a

core/src/mindustry/type/Item.java

@@ -47,6 +47,8 @@ public class Item extends UnlockableContent implements Senseable{
     /** If true, this material is used by buildings. If false, this material will be incinerated in certain cores. */
     public boolean buildable = true;
     public boolean hidden = false;
+    /** For mods. Adds this item to the listed planets' hidden items Seq. */
+    public @Nullable Planet[] hiddenOnPlanets;
 
     public Item(String name, Color color){
         super(name);
@@ -57,6 +59,17 @@ public class Item extends UnlockableContent implements Senseable{
         this(name, new Color(Color.black));
     }
 
+    @Override
+    public void init(){
+        super.init();
+
+        if(hiddenOnPlanets != null){
+            for(Planet planet : hiddenOnPlanets){
+                planet.hiddenItems.add(this);
+            }
+        }
+    }
+
     @Override
     public boolean isHidden(){
         return hidden;