invite 5.x-1.13

New features:
- Added Invite Statistics helper module.
- Added Cancel User Accounts helper module that allow users to terminate user accounts by withdrawing their invitation.
- Moved Invite to its own package namespace.
- #183018: Extract only the e-mail part when processing the submitted e-mails to allow e-mails that contain a display name (eg. Some Name ).

Bugs fixed:
- #196472: Fixed Access denied error after redirecting.
- #186570 by dldege: Fixed Access denied error after sending an invitation if the user doen't have the track invitations permission.
- #182914: Fixed a caching issue for the register form where the e-mail address of a previously invited user was displayed.