Enotify: mailto: implemented verification of (unstructured) header field bodies and improved URI syntax checking.

Removed code duplication between testsuite and commandline tools. Also restructured source code of the tools.

Fixed TODO: made sure main scope used in variables dumping is unreferenced when code dumper is freed.

Fixed amd64 logging segfault; turns out using same va_args in multiple vprintf calls is not possible.