brainnetome is now a ggseg_atlas object (from ggseg.formats) containing
2D polygon geometry.
Atlas recreated from scratch using ggsegExtra::create_cortical_atlas() from
the BN_Atlas annotation on fsaverage5.
Use ggplot() + ggseg::geom_brain(atlas = brainnetome) for 2D plots.
ggseg.formats is now a hard dependency (in Depends).
Package URLs updated from LCBC-UiO to ggseg GitHub organisation.