Universe time + Progress on solar system framework

core/src/mindustry/game/Universe.java

@@ -0,0 +1,48 @@
+package mindustry.game;
+
+import arc.*;
+import arc.util.*;
+
+public class Universe{
+    private long seconds;
+    private float secondCounter;
+
+    public Universe(){
+        load();
+    }
+
+    public void update(){
+        secondCounter += Time.delta() / 60f;
+        if(secondCounter >= 1){
+            seconds += (int)secondCounter;
+            secondCounter %= 1f;
+
+            //save every few seconds
+            if(seconds % 10 == 1){
+                save();
+            }
+        }
+    }
+
+    public float secondsMod(float mod, float scale){
+        return (seconds / scale) % mod;
+    }
+
+    public long seconds(){
+        return seconds;
+    }
+
+    public float secondsf(){
+        return seconds + secondCounter;
+    }
+
+    private void save(){
+        Core.settings.put("utime", seconds);
+        Core.settings.save();
+    }
+
+    private void load(){
+        seconds = Core.settings.getLong("utime");
+    }
+
+}