Checkable Handler Holder
            interface CheckableHandlerHolder<I : State, O : State> : StatesHandler<I, O> 
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Define checkable holder which can be used to precheck that this handler may handle incoming State
Functions
check Handleable
                          
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                        handle State
                          
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                        Main handling of state. In case when this state leads to another State and handleState returns not null State it is assumed that chain is not completed.