Makes the following replacements:

- boost::shared_ptr -> std::shared_ptr
- boost::weak_ptr -> std::weak_ptr
- boost::static_pointer_cast -> std::static_pointer_cast
- boost::dynamic_pointer_cast -> std::dynamic_pointer_cast
- boost::const_pointer_cast -> std::const_pointer_cast
- boost::reinterpret_pointer_cast -> std::reinterpret_pointer_cast
- boost::enamble_shared_from_this -> std::enable_shared_from_this
- boost pointer related includes -> standard library memory