Make serialTextColor dark by default (#3316)
Make serialTextColor dark by default (#3316)


switchinnovations/pxt,switchinnovations/pxt,switch-education/pxt,Microsoft/pxt,switch-education/pxt,switch-education/pxt,playi/pxt,Microsoft/pxt,playi/pxt,switchinnovations/pxt,Microsoft/pxt,playi/pxt,Microsoft/pxt,switch-education/pxt,switch-education/pxt,playi/pxt,switchinnovations/pxt,Microsoft/pxt