Remove hard-coded numbers from recovery actions

* Enable testing in nav2_bringup package

* Fix linter failures.

convert candidate shared ptrs to unique ptrs

Update README.md

Update README.md

- Update navigation_to_pose_action.hpp link as it was pointing to dead file.

- Removed "Current Plan" section as it has already been dealt with.

* Install behavior trees in correct location

* Fix up bt paths in launch files.

Adding recoveries lifecycle server to defaults

Update BUILD.md

bring back cleaning up individual plugins

Use setup.bash instead of local_setup.bash. Make instruction generic for all branch.

* Created a new gazebo world with randomly moving dynamic obstacles. Added a map file for the empty room.

- Dynamic obstacle Gazebo model (Randomly moving box)
- Empty room Gazebo model (20x20 meter empty room with walls)
- A gazebo world model with an empty room and 9 dynamic obstacles.

Build navigation2 in the same workspace as ROS2

* fixed issue 1179

* updated bringup readme, added links to external documentation, tutorials, and the nav2 slam documentation, renamed the nav2 with slam documentation

*  removed warnings

* minor edits