support continue statement

super useful statement, get's rid of need for huge if statements
can easily be implemented under the hood by injecting gotos

example code

for i = 0 to 10 
  item = items[i]
  if item.isLocked
    continue
  end if

  doSomeStuffwithItem(item)
end for

will produce code:

for i = 0 to 10 
  item = items[i]
  if item.isLocked
    goto namespace_class_method_continue1
  end if

    doSomeStuffwithItem(item)

  namespace_class_method_continue1:
end for

note, I suggest we namespace the continue label with namespace_class_method_continue_index, as we could have multiple continues in one method, or even one loop.

it might be we just namespace on per file indexes though (i.e. take filename, and each continue that appears in the file has an index that increments each time a continue is encountered)

Start by tracing how the parser and compiler currently handle for loops, conditional statements, gotos, and labels. Compare the requested continue example with existing control-flow behavior, then determine the label-scoping and numbering rules needed for multiple continues. Done means valid continue syntax compiles correctly and its loop-control behavior is covered by tests.