Here are a few fixes to the DOT parser, particularly in color parsing. The history is a bit verbose, but I would squash it down if that would be better.
ImporterDOT: Dot file color triples are in HSV parameterization.
ImporterDOT: Refactor color parsing into separate function
ImporterDOT: Support HTML color codes
ImporterDOT: Log error on failed color parse
ImporterDOT: Accept commas as well as spaces to delimit HSV colors
ImporterDOT: Rework error handling in color parser
ImporterDOT: Ensure alpha channel is used
ImporterDOT: Add missing nextToken() call
ImporterDOT: Support quoted HTML color codes
Thanks for your contribution! The DOT parser looks better and better.