Cell state as property

	modified:   cellular_automata/cells/base.py
	modified:   cellular_automata/cells/regular.py
	modified:   cellular_automata/lattices/equiangular.py
	modified:   cellular_automata/rules/base.py
	modified:   cellular_automata/rules/game_of_life_rule.py
	modified:   cellular_automata/rules/neural_rule.py
	modified:   cellular_automata/visualization/base.py
	modified:   experiments/game_of_life_test.py
fixes variable square cell experiment

	modified:   experiments/mlp_rule_test.py
	modified:   experiments/variable_equangular_test.py