Update Action so its a functional Interface

Would be better if Action was a single arg functional interface, then we could use java 8 lambdas :) Instead of the current abstract Action we could have the functional interface which accepts the Action as a param in case need to pull passed data from it via https://github.com/doridori/Engine/blob/master/src/main/java/com/kodroid/engine/FsmEngine.java#L433
