Implement basic qunativie checks

1aim / DELETE-THIS-mail-types

Encoding/Decoding (roughly read Generating/Parsing) of mails in rust, including limited unicode support

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Closed rustonaut closed 7 years ago

rustonaut commented 7 years ago

[x] headers which can appear at most once are checked to appear at most once
[x] headers which have to appear at last once are checked to appear at last once