Recombine AMCL library components with AMCL to have consistent license (#1074)

* 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