Ignore "Future Errors"

Changed

• When an error is thrown and we're ahead of the current function in the stack, re-throw it
  • This can occur when an error is thrown from done() and our synchronous try..catch sees it
  • It could also be reproduced internally by getting into an inconsistent state - theoretically if a function did next(); throw new Error() it'd diverge and handle future functions, then catch and handle the error functions in the same stack (breaking user expectations)
• Added debug for stderr logging
• Add generics to type signatures for req, res, next