replaced simpleStateExample class by StateMachineApplication.java. This
new class is a copy of simpleStateExample and holds some
simplifications.
Renamed lwr state interface and further classes containing LWR in their
name.
added enum for openIGTLinkErrorCodes and thus refactored code.
further refactoring of all classes using the opentIGTLink errorCode. Now
they use the corresponding enum.