Safe delete for mailboxes

Closes #6113

See merge request !1454

Delete mail_domain after mail_user records

Closes #6331

See merge request ispconfig/ispconfig3!1598

nginx: Added ACME redirect to main domain based on alias domain fix

Closes #4618

See merge request !1604

Also cleanup databases when a client is deleted, fixes #6304

Closes #6304

See merge request !1596

Resolve "Lower the entropy test value in BIND plugin to 200"

Closes #6366

See merge request !1619

Show the client name on the delete confirmation page

Closes #6334

See merge request !1601

Warn about duplicate code in a comment

See merge request !1597

Backport MR !889, unify settings between distros and improves

See merge request !1609

Change deprecated JQuery .load() to .on("load") - #6322

Closes #6322

See merge request !1607

Resolve "API to get mail user details for all account that belong to a domain"

Closes #6333

See merge request !1600

Add API function mail_user_get_all_by_client, #6332

Closes #6332

See merge request !1599

Added user field to datalog list view

Closes #6370

See merge request !1621

Check for different pure-ftpd log file locations (fixes FTP stats for EPEL/RHEL)

Closes #6378

See merge request !1625

- Updated edit links in html template

Resolve "Two-factor authentication"

Closes #2558

See merge request !1575

Resolve "Send email to reseller when quota is reached"

Closes #6346

See merge request !1608

Add Copy to clipboard button to shell user account and emailboxes

Closes #6230

See merge request !1543

Typo, update ispconfig.css

See merge request !1606

This allows sites using redirect=proxy to still generate ACME
certificates by not passing the acme requests through to the proxy.

We should also consider using this for other features available such as
own error documents, SSI and custom directives.