Catch-all customizable sender for Thunderbird for Android

[kewisch]

As per https://github.com/thunderbird/thunderbird-android/issues/935

Identity selection could be enhanced to make life a lot easier for people who have a catch-all domain, similar to how Thunderbird allows customizing the sender.

Identity selection should be :
-free to edit and modify when writing a message (more or less as the recipient field currently is)
-automatically set with the best value guessed from the recipient values, when replying.
This would be a great feature to differentiate K9 mail from other rigid email clients.

[Jon]

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