* Fix memory leak in nav2_recoveries

* Fix recovery server memory leak (better interface)

* Fix costmap2d memory leak

* Fix nav2_navfn_planner memory leak

* Fix planner server and navfn planner memory leak

* Make all rclcpp::Node::SharedPtr argument passing const

* Fix controller server and DWB plugins memory leak

* Minor fixes

* Fix formatting errors

* Change all plugin interfaces to use weak_ptr intead of shared_ptr to parent rclcpp::Node

* Convert all SharedPtr to WeakPtr

* Check shared_ptr after lock and before dereferencing