Misc fog improvements

core/src/mindustry/game/Rules.java

@@ -115,6 +115,8 @@ public class Rules{
     public ObjectSet<Item> hiddenBuildItems = new ObjectSet<>();
     /** HIGHLY UNSTABLE/EXPERIMENTAL. DO NOT USE THIS. */
     public boolean fog = false;
+    /** If fog = true, this is whether static (black) fog is enabled. */
+    public boolean staticFog = true;
     /** Color for static, undiscovered fog of war areas. */
     public Color staticColor = new Color(0f, 0f, 0f, 1f);
     /** Color for discovered but un-monitored fog of war areas. */