Add support for UTF-8 in message

[rbosse]

Had this error:
Wide character in print at /usr/bin/msgconvert line 58.

[sigurdtheone]

This can be solved by adding "use open ":std", ":encoding(UTF-8)";" to the top of /home//perl5/bin/msgconvert

[mvz]

If anyone seeing this error can provide the following, that would be great:

• A msg file that triggers the problem
• The command line you use to trigger the problem
• The operating system you're using

[ojwb]

There's actually a file which triggers this in the testsuite already, and no other command line options are required:

$ script/msgconvert t/files/plain_uc_wc_unsent.msg
Wide character in print at script/msgconvert line 58.

I'm using Debian unstable.

(I'm not yet sure if this is the same problem or not, but FWIW I'm getting a similar issue in my own code when I request body_str on an Email::MIME object I get from Email::Outlook::Message:

Wide character at /usr/share/perl5/Email/MIME.pm line 376.

I'm in the process of investigating, went to check if someone had reported it already, and found this ticket and that the file I was testing with triggers this issue too.)

[ojwb]

@mvz I found that the output file in msgconvert used to be set to be :utf8 but that was removed by #7.

In #7 it is mentioned that things are still broken until rjbs/Email-MIME#36 is merged in Email::MIME, but that PR doesn't seem to have gone well and was closed without merging.

It's still unclear to me exactly what's broken and where, but I don't think it's msgconvert (or at least not entirely) as I'm seeing similar issues with my own code.

[ojwb]

My proposed changes from #17 eliminate this error:

$ perl -Ilib script/msgconvert t/files/plain_uc_wc_unsent.msg
$

(-Ilib is just needed so that the in-tree module is used rather than the system-installed one.)

[mvz]

Thanks for looking into this @ojwb