Add "Quick-Reply" feature to read window (readmailgroup)

Phenomenon

It would be favourable if the read window would have a "Quick-Reply" possibility where the user could quickly enter some multi-line text and press "Send" to send out a direct reply to the currently displayed mail. This would allow to send a reply without having to open a full write window, etc.

Implementation recommendation

A small TextEditor.mcc object have to be added on demand to the bottom of the read window for that purpose with two buttons "Send" and "Cancel". The original text should be quoted in there like in a normal write window reply action. But no attachment possibility presented.