Store ligt/dark TGLColorSet as members in CmsShowCommon, do not rely on default Eve viewer being present.

(cherry picked from commit b68729af886b60eb66432c38be2a23ab40d5407a from osschar:fworks-mt-1)
GeometryView -- add context menu entry for applying color to children.

(cherry picked from commit 1aaad1cdf96d8246ae6570844d4908ca1de4669b from osschar:fworks-mt-1)
Merge pull request #6034 from osschar/fworks-mt-1-71x

Configuration load bugfix + GeometryView improvement