[feature] multi-level break

[RiedleroD]

sometimes it so happens that I need to break out of multiple loops at once. for that, some languages have break <n>, where n is the number of loops to break out of.

for i in {1..3}; do
  for j in {2..5}; do
    if [[ $j == $i ]]; then
      break 2
    fi
  done
done