Fix string const cast warning in colour bar glyph. Issues 3626 and 2107.
Fix string const cast warning in colour bar glyph. Issues 3626 and 2107.


hsorby/zinc,OpenCMISS/zinc,OpenCMISS/zinc,OpenCMISS/zinc,OpenCMISS/zinc,hsorby/zinc,hsorby/zinc,hsorby/zinc