PowerAction parsing work.

src/engine/wpak/PowerActionParser.java

@@ -96,6 +96,7 @@ public class PowerActionParser {
                 case "ApplyEffect":
                 case "DeferredPower":
                 case "DirectDamage":
+                case "Invis":
                     while (headerIterator.hasNext()) {
                         effectDescription = new EffectDescription();
                         effectDescription.effect_id = headerIterator.next();