Feature: #89227 - Ask for email address while installing TYPO3

See forge#89227

Description

It is now possible to enter an email address for the first admin user while installing TYPO3.

Within the install process, an admin user will be created by entering a username and password. The user is asked for the email address as well, so this can be used later on to e.g. notify the admin if somebody logged-in (Warning email address).

This will also work in the install tool Maintenance module "Create Administrative User" card.