fix encoding of email addresses

[rjbs]

We saw cases where a user with the "real name" of Bob"Smith could cause problems in how we'd send them mail. This branch will fix that.

Previously, the code often naively formed To or From headers with code like this:

my $to_header = qq{"$asciiname" <$email>};

This worked most of the time. Given an $asciiname with " in it, though, it would break. Probably one that ended in \ would break, and probably other case. Also, it's much nicer to use people's full names, rather than ASCII!

We send our emails using Email::MIME. Email::MIME allows certain kinds of objects to be provided for certain kinds of headers. Notably, an Email::MIME::Header::AddressList object can be passed for To, From, Cc, Reply-To, and some others. This branch makes it much easier to get or create AddressList objects, and then uses them in most places where emails are created.

• the PAUSE::Email library now exists, with methods for getting common addresses (internal reporting, contact-us, noreply) and for building new AddressLists
• the PAUSE::MailAddress library, used to pick user email addresses, can now supply AddressList objects using properly encoded non-ASCII names
• the various contact addresses in $Config are made clearer

[rjbs]

The edit_cred pause_2017 test is failing. I can't really tell why. I'll look into it more sometime soon, but maybe somebody (charsbar… 😉) can tell.

I did edit lib/pause_2017/PAUSE/Web/Controller/User/Cred.pm so I will go read that first…

[rjbs]

This may be ready for review…