Fix #421

[NLS-04]

fixed bug stated in #421 by segregating the orignal tokenize function into a three step process.

for (auto line : llvm::enumerate(program)) {
  ...

  runOperation(tokens, tokenizeQuotes, tsl, line.value());

  runOperation(remainingTokens, splitCommentFromLine, tokens);

  runOperation(joinedParentheses, joinParentheses, tsl, remainingTokens );

  ...

[mortbopet]

LGTM - looks like formatting is off, though. Thank you for finding and fixing the issue :). Please add a test in the assembler tests to verify the fix.

[NLS-04]

Added a test for the now corrected parentheses matching.
All tests pass sucessfully.

Totals: 20 passed, 0 failed, 0 skipped, 0 blacklisted, 5682ms
********* Finished testing of tst_Assembler *********

[mortbopet]

My apologies for the slow response - feel free to @ me in the future in case i forget to review :).