Global sector items / Mod file reading

core/src/mindustry/game/Universe.java

@@ -163,6 +163,21 @@ public class Universe{
         save();
     }
 
+    /** This method is expensive to call; only do so sparingly. */
+    public ItemSeq getGlobalResources(){
+        ItemSeq count = new ItemSeq();
+
+        for(Planet planet : content.planets()){
+            for(Sector sector : planet.sectors){
+                if(sector.hasSave()){
+                    count.add(sector.calculateItems());
+                }
+            }
+        }
+
+        return count;
+    }
+
     public float secondsMod(float mod, float scale){
         return (seconds / scale) % mod;
     }