More poweraction parsing work.

src/engine/wpak/PowerActionParser.java

@@ -240,6 +240,9 @@ public class PowerActionParser {
                     case "TARGETBECOMESPET":
                         powerActionEntry.targetBecomesPet = Boolean.parseBoolean(lineValues[1].trim());
                         break;
+                    case "DESTROYOLDPET":
+                        powerActionEntry.destroyOldPet = Boolean.parseBoolean(lineValues[1].trim());
+                        break;
                     case "APPLYEFFECTOTHER":
                     case "APPLYEFFECTSELF":
                     case "WEAROFFEFFECTOTHER": // Keys not parsed go here.