Switch to stdin/-out processing
Switch to stdin/-out processing

- Switch to -stdin and -stdout which generally enables background linting.
- Since setting `jar` is mandatory, fail early if not set and show nice
  error message.
- Since 'jar' is an argument to the java binary do not handle it via
  `$args`. $args should only contain arguments to the cflinter.

ckaznocha/SublimeLinter-contrib-CFLint