Add chr() function to convert numbers to unicode characters.
Add test cases for chr().
Change FontDialog button to do "copy to clipboard".
Merge pull request #906 from openscad/text-fixes-5

Change FontDialog button to do "copy to clipboard".
fontconfig check by Don Bright
Colormap functionality from pull request #816, mostly by Don Bright, includes new colormaps by shaina
new test results
forgot to add colormap class
Removed duplicate DIFFPNG section
doc
Updated expected image to pass DIFFPNG tests
Renamed CGAL_renderer to CGAL_OGL_Polyhedron for clarity
Use the same test results for all STL/OFF export-import tests
Missed tagging of projection-cut-tests as 2D
Missed tagging of lwpolyline tests as 2D
#587 Reorganized some tests to better distinguish between 2D and 3D tests. Added DXF export tests
Silence fallback lookup warnings
#703 Don't try to export empty objects
#703 Don't try to export empty objects
#703 Ignore faces with <3 vertices while checking for convexity. Fixes crash