[Snails] Fixed ProgressListener signal signatures.
[Snails] Proper certificates creation.
[Snails] Fixed signature.
[Snails] Proper vmime::string usage.
[Snails] Properly create the session.
[Snails] Added missing include.
[Snails] Pass the message set to folder::getMessages().
[Snails] Constant for utf8.
[Snails] Proper getUID() usage.
[Snails] Fixed signature.
[Snails] vmime::create -> vmime::make_shared.
[Snails] Proper casts.
[Snails] Proper type.
[Snails] Fetch flags -> fetchAttributes.