TODO:
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- Binary File Attachements, function for Decrypt & Help-Text (like safe eml, etc)

- sorting keys would be nice (e.g. a-z or complete manual)
- Policy ( dialogs, what's warning, what an error )
- Encrypt to self (problem: who is self?)
- on windows an empty directory gnupg in applivation-data is created, find out
how to disable

- Keyimport, first: function Keyimport should use QByteArray, then:
  - More Keymanagement (new popup window?) including:
    - copy a public-keyfile into the editor-window and enable importing it -> same as "Import Key from Clipboard?"
    - Import Key from Clipboard
    - export public key
    - export private key
    - generate new key
    - import keyfiles in non ASCII-Amor-format (always and everywhere error-free keyimport would be great)
    - Import key from Keyserver

- Tabbed editor (including useful things like encrypted data opens in new tab)

- some kind of locking for keydb, as gpg.conf uses lock-never, for ability to run on usb-drives (fat-formatted)

usability:
- dialog on closing unsaved document (discard/cancel/save) is not very user-friendly

advanced:
- threading & thread-safety in context.cpp (in, out, ctx)

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Use QStringList instead of QList<String>