WIP campaign difficulty dialog

core/src/mindustry/game/Difficulty.java

@@ -0,0 +1,26 @@
+package mindustry.game;
+
+import arc.*;
+
+public enum Difficulty{
+    //TODO these need tweaks
+    easy(1f, 0.75f, 1.5f),
+    normal(1f, 1f, 1f),
+    hard(1.25f, 1.5f, 0.6f),
+    eradication(1.5f, 2f, 0.4f);
+
+    public static final Difficulty[] all = values();
+
+    //TODO add more fields
+    public float enemyHealthMultiplier, enemySpawnMultiplier, waveTimeMultiplier;
+
+    Difficulty(float enemyHealthMultiplier, float enemySpawnMultiplier, float waveTimeMultiplier){
+        this.enemySpawnMultiplier = enemySpawnMultiplier;
+        this.waveTimeMultiplier = waveTimeMultiplier;
+        this.enemyHealthMultiplier = enemyHealthMultiplier;
+    }
+
+    public String localized(){
+        return Core.bundle.get("difficulty." + name());
+    }
+}