Two emails for one user

[erlend_sh (Erlend Sogge Heggen)]

Progress on this feature can be tracked here:

Additional email address per user account support

After some chat with the @team, we’re moving forward with this feature request cautiously together, and in phases. Phase 1 Phase 1 won’t change anything but the architecture of how a user’s email address(es) are stored. No new features, just some well executed database migrations: Create a new user_email table, with: email column, unique with special handling to support case insensitivity (treating bob@ and BOB@ as the same) user_id column timestamps Migrate the email column from the use…