Improve security

Closes #5985 and #5984

See merge request ispconfig/ispconfig3!1380

Resolve "Don't use md5 hashing for remote user passwords"

Closes #5986

See merge request ispconfig/ispconfig3!1381

5970 confidential issue

See merge request ispconfig-confidential/ispconfig3!4

5985 confidential issue

See merge request ispconfig-confidential/ispconfig3!3

- update user password with new hashing algo on login
- delete initial password from ispconfig sql file

5984 confidential issue

See merge request ispconfig-confidential/ispconfig3!2

- don't make sql request on invalid arguments in password reset form

addendum fixes center of database quota dashlet closes #5954

Closes #5954

See merge request ispconfig/ispconfig3!1373

fix bind plugin loglevel error

See merge request ispconfig/ispconfig3!1372

add CI test to install ispconfig in a clean container

See merge request ispconfig/ispconfig3!884

don't allow empty web_folder

Closes #5976

See merge request ispconfig/ispconfig3!1368

Additional PHP versions - Fix php_fpm_socket_dir

Closes #5973

See merge request ispconfig/ispconfig3!1366

Update 500-clean_mailboxes.inc.php

Closes #5909

See merge request ispconfig/ispconfig3!1367

Add numerical check for subnet (#5975)

Closes #5975

See merge request ispconfig/ispconfig3!1369

Allow subnet for xfer and also notify (#3122)

Closes #3122

See merge request ispconfig/ispconfig3!1358

Fixing tls1.3 in nginx config file

Closes #5971

See merge request ispconfig/ispconfig3!1364

manual database backups scheduled once per server

Closes #5933

See merge request ispconfig/ispconfig3!1361

Enrich datalog pages with links for more types

See merge request ispconfig/ispconfig3!1363

Merge branch '5969-letsencrypt-certbot-does-not-create-webroot-map-anymore-for-new-domains' into 'develop'

Resolve "Letsencrypt (certbot) does not create webroot map anymore for new domains"

Closes #5969

See merge request ispconfig/ispconfig3!1360

Update sites_web_domain_add.php

See merge request ispconfig/ispconfig3!1359