Add configuration to override email receipient in all emails send from YAWIK.

[TiSiE]

Mainly in development installations it is useful, when it is assured, that all emails send from the system are sent to a general address rather than the original receipient.

[TiSiE]

You can now enable recipient override in the configuration array under the key "mails->develop->override_recipient".

More info in the file module/Core/config/core.mails.development.php.dist