allow copies

core/src/mindustry/game/Rules.java

@@ -40,6 +40,8 @@ public class Rules{
     public boolean reactorExplosions = true;
     /** Whether schematics are allowed */
     public boolean schematicAllowed = true;
+    /** Whether copying is allowed */
+    public boolean copyAllowed = true;
     /** Whether units use and require ammo. */
     public boolean unitAmmo = false;
     /** How fast unit pads build units. */