[FEATURE] Allow setting a default replyTo-email-address

If no other email-address is set as reply-to use this address
as default. This is similar to the existing defaultMailFromAddress.

Change-Id: Iabdf282203c1989036867a6c97b9cbe329e61f60
Resolves: #78332
Releases: master
Reviewed-on: https://review.typo3.org/50263


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>