Message charset: mb_convert_encoding + aliases

[Slamdunk]

• Move to pure mb_convert_encoding
• Implement charset aliases, see https://dxr.mozilla.org/mozilla1.9.1/source/intl/uconv/src/charsetalias.properties
• Fix Message body charset parsing
• Fix Message headers charset parsing

[Lewiscowles1986]

Damn... Good work 👍 🥇

[Slamdunk]

@Lewiscowles1986 thank you. Stay tuned for the 1.0 milestone.

You seem to have faced a lot of edge cases in the email universe: I would love to have your help in gathering them so we can stress test the library.

[Lewiscowles1986]

The problem is that without decoding the emails I can't tell if they contain private or confidential information. It's like being on the edge of an edge...

I am digging through a branch backup in spare time to see if there is anything I can share.

The app itself dumps to a sqlite DB, so I can get information like unique headers, content type. I see I have a couple of changes to the lib that need tests. I'll create issues as needed.