Replace multiple set state method calls with a single set state method call.

[joshuaplusone]

virtual bool setStarting(std::function<int()> state_method) = 0;
virtual bool setExecute(std::function<int()> state_method) = 0;
virtual bool setCompleting(std::function<int()> state_method) = 0;
virtual bool setAborting(std::function<int()> state_method) = 0;
virtual bool setClearing(std::function<int()> state_method) = 0;
virtual bool setStopping(std::function<int()> state_method) = 0;
virtual bool setResetting(std::function<int()> state_method) = 0;
virtual bool setSuspending(std::function<int()> state_method) = 0;
virtual bool setUnsuspending(std::function<int()> state_method) = 0;
virtual bool setHolding(std::function<int()> state_method) = 0;
virtual bool setUnholding(std::function<int()> state_method) = 0;

should be replaced with

virtual bool setStateMethod(StatesEnum state, std::function<int()> state_method) = 0;