Fixed clang warning.

Changed default Linux POV-Ray output to png.

Fixed static analysis warnings.

Updated version number.

Fixed parts list showing parts with invalid colors.

LeoCAD 0.83.1 tag.

LeoCAD 0.83 tag.

LeoCAD 0.82.2 tag.

LeoCAD 0.82.1 tag.

LeoCAD 0.82 tag.