* Add proper SPDX license IDs and repo LICENSE file

* Fixing a minor linter typo

Adding a link to the upstream documentation on behaviortree.dev

* Move AMCL library files back to nav2_amcl package

* Fixing up naming so things compile again

* Transition copyright disable check to follow eig3 files.

* Transition amcl files license to LGPL 2.1

* Adding missing copyright headers to nav2_bringup package

* Adding missing copyright headers to nav2_common

* Fixing up include guard to match coding style

* Reformatting license to pass the copyright check

The change here is only whitespace changes - line length and paragraph
spacing, as well as the addition of the license title

* Relicensing file to better match the existing package

* Fixing readme to account for the new change

Removing deprecation warning

* generic ros service caller BT node

* BT specialty service callers using BT node service

* rename to reinitialize global localization

* uncrustify/lint

* changes per PR requests

Export envs for arg in build hook

Signed-off-by: Louise Poubel <louise@openrobotics.org>

Extend CI Workflow to test multiple RMW

Add GraphicsMagick API and use it to implement map_saver, map_loader
Removes dependency on SDL, creates installation dependency on libgraphicsmagick++; apt package libgraphicsmagick++1-dev
Allows saving in trinary, raw, or scale mode.
Added configurable image format pgm, png, etc.
Add warning when using scale mode with opaque format.
Remove SDL from map server
Extract repeated MapMode to shared enum class
Switch writing YAML to same library that reads it (yaml-cpp)
Add --help alias to map saver -h
Extract map yaml loading to its own function, with better error messages. Also fixed crash due to misuse of std::string constructor.