Use target's exposed pxtCoreDir (#737)
Use target's exposed pxtCoreDir (#737)


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