Implement coreLibraryDesugaring feature#3797

jewelshkjony wants to merge 5 commits intomit-cml:mastermit-cml/appinventor-sources:masterfrom

jewelshkjony:feature-add/core-library-desugaringjewelshkjony/appinventor-sources:feature-add/core-library-desugaringCopy head branch name to clipboard