* Per review feedback, rename the nav2_controller to be nav2_lifecycle_manager

To avoid confusion with low-level controllers, be more explicit in the name.

* Avoid colliding node names; make navigation dialog's node name generic

* Add the lifecycle controller

* Generalize the nav2_controller code.

The only nav2-specifics are now the list of node names.

* Some reformatting

* Rename the Srv service to be more explicit; Add description to the package XML file

* Address more review feedback

* 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

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

The limited acceleration controller derives from the standard
controller. By switching to the standard controller, we can
eliminate a bit of complexity while debugging.

Some of the packages used http://download.ros.org/schema/package_format2.xsd
that requires package format to be set to `2`, but package format was
set to 3 instead.

This change makes them consistent.  As a result linter for packages
won't compain on this error.  Version 3 picked up because it is superset of
version 2 with addition of optional fields.

* human readable and more meaningful info/debug logs
* change paths to include full representations
* cleanup
* resolve crdelsey's grammar concern
* oops missed a tag
* shutdown infos

* Documentation on local planner changes for ROS 2.

* Adding more detail on local planner operatiion in the new model.

* Addressing feedback.

* Fixing issue links

This resolves #149

This is partial progress on #149

Changing calls to now() to always use a node reference instead of instantiating a clock object (#172)

* Changing now() to use the node clock in DWB

* Fixing clock usages to use node clock in costmap, amcl and map server.

* changing oregon team email to Carls

* changing header gaurds

* gaurds galore

* Fixing time delays. Duration object takes nanoseconds, not seconds

* Fixing DWB. It runs and almost follows a path.

No pose seems to be available, so it just publishes zero velocity.

* Addressing review comments.

* moved over
* moving all messages into an internal msgs metapackage grouping
* moving all the messages into a homologated package
* making necessary changes for the msgs package homologation
* adding metapackage
* adding  myself as a maintainer
* build script and doc updates for package in workspace
* dealing with merge issues
* remove author fields
* moving around
* merge conflict v3
* remove costmap 2d from utils
* killing src dir
* remove costmap 2d clone #3
* remove extraneous file
* kill dwa for some reason
* dwb rectification
* removing oregon author -> maintainer
* controller -> nav2_controller
* adding new msgs  to new things
* tags
* bringup pkg
* compiling with task status mode
* getting the task status to compile for dwa
* adding costmap2d into nav2 naming nominclature
* adding controller metapackage
* recursive definitions -- bringup cannot be inside of the metapackage
* kill bad line
* hopefully actual last git merge error...
* changelog resolve