Cache hash codes of States.
Cache hash codes of States.

This cuts the building time of automata in less than half.

jobtg/dictomaton,pkoduganty/dictomaton,jobtg/dictomaton,danieldk/dictomaton,jobtg/dictomaton,pkoduganty/dictomaton,danieldk/dictomaton,pkoduganty/dictomaton,danieldk/dictomaton