The AbstractDynamicMenu support "Send SMS" feature, meaning it can send message and wait for the response, a very similar
behavior to the base "Send SMS" state. This processMessageLogic(SmappStateProcessingContext) method will be called during
processing of the incoming message. This method processes the incoming message, most likely, containing the selected menu
item. The message can be either a selection or a menu control (such as: more or exit).
If the incoming message contains a valid selection of menu item index, the saveSessionVariables(String, String) method will
be called followed by continueOk().
If the incoming message conatins a valid menu control index, the processing is forwarded to processStateLogic(SmappStateProcessingContext,
SmappStateProcessingAction) method.
Intentionally made final so that it cannot be override.