FEAT: added error messages for EXIT/RETURN if used from the interpreter (not yet implemented).
FEAT: added error messages for EXIT/RETURN if used from the interpreter (not yet implemented).

rheber/red,rheber/red,iArnold/red,red-eco/red,vehar/red,NikolayShubenkovProgSchool/red,iArnold/red,vehar/red,red-eco/red,NikolayShubenkovProgSchool/red