Added non-const begin() and end() to PlanetsUniverse. (the const ones are now cbegin() and cend())
Added non-const begin() and end() to PlanetsUniverse.
(the const ones are now cbegin() and cend())

chipgw/planets-3d,chipgw/planets-3d,chipgw/planets-3d,chipgw/planets-3d