CadQuery syntax highlighting

[njourdane]

syntax highlighting is a very handy feature on many IDEs and is partially supported in CQ-editor (well done!).

It could be even better if CadQuery's builtin functions (Workplane, box, center, hole, etc. - basically all what is listed in the CadQuery Class reference) were rendered with a different color, or maybe with several colors (but not too many), in order to distinguish Core classes, Selector Classes, etc.