Build cost/speed rules

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

@@ -25,6 +25,8 @@ public enum RulePreset{
         pvp = true;
         enemyCoreBuildRadius = 600f;
         respawnTime = 60 * 10;
+        buildCostMultiplier = 0.5f;
+        buildSpeedMultiplier = 2f;
     }});
 
     private final Supplier<Rules> rules;

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

@@ -19,6 +19,10 @@ public class Rules{
     public boolean pvp;
     /**Whether enemy units drop random items on death.*/
     public boolean unitDrops;
+    /**Multiplier for buildings for the player.*/
+    public float buildCostMultiplier = 1f;
+    /**Multiplier for building speed.*/
+    public float buildSpeedMultiplier = 1f;
     /**No-build zone around enemy core radius.*/
     public float enemyCoreBuildRadius = 400f;
     /**Player respawn time in ticks.*/