Metapackage + Reorg + build script updates (#107)

* 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