Moved transition and neighborhood rules to separate folders for clarity

include/neighborhood_rules/arbitraryneighborhoodrule.hpp

include/neighborhood_rules/mooreNeighborhoodRule.hpp

include/neighborhood_rules/vonNeumannNeighborhoodRule.hpp

include/transition_rules/lifegametransition.h

src/neighborhood_rules/arbitraryneighborhoodrule.cpp

src/neighborhood_rules/mooreNeighborhoodRule.cpp

src/neighborhood_rules/vonNeumannNeighborhoodRule.cpp

src/src.pro

src/transition_rules/lifegametransition.cpp

tests/tests.pro