renamed Simulator <-> SimulatorBase
ParticleSimulator inherits ecell4::Simulator
the current time is stored in a World, but not in a Simulator
RandomNumberGenerator is stored in a World
just reformatted
World can bind to a ecell4::Model
implemented new new_particle functions with checking overlaps
ParticleSimulator internally wraps ecell4::Model in NetworkRulesAdapter
reorganized typedefs in Traits of containers
stop to use unassignable_adapter