add labeled loops, labeled break, labeled continue. remove goto

closes #346
closes #630

regression: translate-c can no longer translate switch statements.
after #629 we can ressurect and modify the code to utilize arbitrarily
returning from blocks.
8bc523219cAndrew Kelley committed on 12/21/2017, 4:00:19 AMparentd686113
15 files changedLine totals unavailable