Support for multiple power enrties.

src/engine/wpak/PowerEntry.java

@@ -8,11 +8,11 @@
 
 package engine.wpak;
 
-public class PowerEntry {
+import java.util.ArrayList;
 
+public class PowerEntry {
     public String power_id;
-    public String power;
-    public String power_type;
+    public ArrayList<PowerData> powers = new ArrayList<>();
     public int icon;
     public String powerbase;
     public String target_type;