remove extra test node

added forced callback, custom validation callback example, and passed linters (except xmllint) & uncrustify

* rosdep resolve missing keys roscpp gazebo localizier planning tests

* metapackage missing a few packages

* removing bringup for recursive dependencies

* Fixing merge issues that break DWB.

restores the missing changes. This change is required to make
the robot move.

* Returning controller output topic to cmd_vel

* Rename the costmap_world_model
* Remove placeholder .gitignore files

The original idea was that we might have different world model implementations. However, as it turns out, we will likely only have the one implementation that evolves over time. So, we don't necessarily want to emphasize that it is costmap-based, but want to allow for other representations going forward. Hence the name change.

* Enable behavior trees and work on cancel capability
* Checkpoint working cancel with traces
* ExecuteMission behavior tree working w/ cancel
* A little clean-up
* Address cpplint and uncrustify issues
* Parameterize the loop rate for the behavior tree classes
* Build a parallel behavior tree for the NavToPose task
* Update the BT Navigator behavior tree to compute a path first before starting the parallel nodes
* Resolve how to handle BTpp dependency; Closes: #51
* Rebase to origin/master
* Inital port to new, updated repo for the behavior tree library
* Can't use shared_from_this in constructor; fix several linter issues
* Start on dynamically creating the behavior tree from an XML description
* Move a few files after rebasing
* Don't have to explicity specify dl dependency
* Working on execute mission BT
* Adapt the BtActionNode class to enable it to by dynamically created
* Checkpoint working version
* Another checkpoint for working version
* Clean up
* Enable the BtNavigator with the new behavior tree library
* Start hooking up params
* Adapt to new Behavior Tree library
* Pass position and orientation when using pose via rviz
* Missed a new file
* Re-enable getting pose from robot; was commented out for debugging
* Revert one of my changes for the BehaviorTree.CPP library now that it is fixed
* Back out the workaround for visibility warning now that it is fixed in the upstream library
* Rebase and cpplint/uncrustify
* Get rid of hardcoded starting position in compute_path_to_pose_action and address some linter issues
* Make the intent clearer for a couple variables names
* Fix a couple inconsistencies with the last checkin

* nav2_msgs readme

* adding readme nav2_msgs suggestions

* removing detailed walk through for link to ROS 2 Migration Guide

package xml release IDs the same

adding bringup readme and config folder for rviz configuration file

Add links to other README.md

Integrate costmap with DWB- Make robot move

* adding PR template

* removing empty template fields

* removing awkward HMTL tags for commented examples

Disabled getting the plugin list from parameters. Instead, it is
hard coded. The parameters are frequently not ready yet at the
time this call is made causing either a crash or just silently
not loading the plugins.

The transform buffer lifetime is part of the dwb controller. It
can't be managed by shared_ptr.