Passing license check with ros_license_linter

[matthias-mayr]

Ideally the repo should pass the ros_license_linter check.

Right now it does not, because of these files:

The following files contain licenses that are not covered by any license tag:
  'README.md': ['CC-BY-SA-4.0']                --> The readme contains a bib entry for the paper
  'res/orcidlink.sty': ['LPPL-1.3c']           --> The stylefile of the JOSS paper
  'src/pseudo_inversion.h': ['LicenseRef-scancode-public-domain']  --> valid

The issue is handled here: boschresearch/ros_license_toolkit#24
Once it is fixed, the Github action could be integrated.