More powerAction work

src/engine/wpak/PowerActionParser.java

@@ -182,6 +182,7 @@ public class PowerActionParser {
                 case "TreeChoke":
                 case "SimpleDamage":
                 case "MobRecall": // One argument always zero
+                case "ClearAggro":
                     break;
                 default:
                     Logger.error("Unhandled type " + powerActionEntry.action_type + " for Pow4erAction: " + powerActionEntry.action_id);