Settings menu layout improved / Rule dialog improvements

core/src/io/anuke/mindustry/game/Rules.java

@@ -37,6 +37,8 @@ public class Rules{
     public float buildSpeedMultiplier = 1f;
     /** No-build zone around enemy core radius. */
     public float enemyCoreBuildRadius = 400f;
+    /** Radius around enemy wave drop zones.*/
+    public float dropZoneRadius = 380f;
     /** Player respawn time in ticks. */
     public float respawnTime = 60 * 4;
     /** Time between waves in ticks. */