public void AddSystem(ISystem system)
{
Mononoke.Logger.Print(system.GetType().Name);
Type t = system.GetType().BaseType.GetGenericArguments()[0];
if (_systems.ContainsKey(t))
{
throw new Exception("There can only exist one system of a single type.");
}
_systems.Add(t, system);
foreach (Entity e in _entities)
{
system.Accept(e);
}
}