remove unneeded "certificate exists" message

Closes #5757

See merge request ispconfig/ispconfig3!1206

fixed server id and type limit on interface (from !1230)

See merge request ispconfig/ispconfig3!1231

Resolve "Directive snippets not saved and not applied"

Closes #5785

See merge request ispconfig/ispconfig3!1230

- removed master_directive_snippet code that was (in 2016) accidently backported from master but never used

- move all updates to onAfterUpdate
- remove server parts that are not needed

Custom PHP variables are not apply when configured in Directive Snippet

See merge request !1209

Merge branch '5784-missing-symlinks-to-etc-letsencrypt-live-on-certbot-during-install-update' into 'develop'

Resolve "Missing symlinks to /etc/letsencrypt/live on certbot during install/update"

Closes #5784

See merge request ispconfig/ispconfig3!1228

Resolve "subdomains DKIM Signing & rspamd"

Closes #5782

See merge request ispconfig/ispconfig3!1227

Resolve "Can't change Directives Snippes"

Closes #5780

See merge request ispconfig/ispconfig3!1226

Resolve "Don't use getcwd inside the installer"

Closes #5781

See merge request ispconfig/ispconfig3!1225

Only use NameVirtualHost for Apache 2.2 (#4230)

Closes #4230

See merge request ispconfig/ispconfig3!1223

no need to verify recipient addresses for rspamd

See merge request ispconfig/ispconfig3!1224

clear negative address verify cache every 60s

Closes #5772

See merge request ispconfig/ispconfig3!1217

Resolve "dataLogTimer is not defined"

Closes #5119

See merge request ispconfig/ispconfig3!1221

Sieve redirect needs :copy

See merge request ispconfig/ispconfig3!1220

Resolve "autoinstall.ini haven't option for new question"

Closes #5763

See merge request ispconfig/ispconfig3!1218

Removed minified js file as it is unused