Handle mobileconfig display names with special characters

imapsync command execution changed

Second unlocking lock_file failed because it was already unlocked.

imapsync table column "returned_text" changed into type "longtext". "mediumtext" is to small for imapsync output on large mailbox.
db version value updated.

Moved setting "is_running" status to just before the actual execution of imapsync command.

Fix: Reset is_running status in case of exception occurs in running imapsync. Else it will stuck in "running" status.

Fix executing imapsync command containing quoted strings in parameters.

I missed using ENT_NOQUOTES since XML only needs & and <> to be replaced in tags, spotted by @mkuron

If the account display name contained special characters like & the mobileconfig would fail to import on the iOS device.

[Compose] Update Dovecot image

Update lang.nl.php

Update Dovecot to v2.3.6 and Pigeonhole to v0.5.6

Added domain alias handling to quarantine mails and added recipients row to quarantine mail display

If a mail is sent to a domain alias domain and rejected, mailcow does not currently store the mail in quarantine.
This commit adds domain alias handling to the reject code and should fix this behavior.

Also added displaying of recipient addresses into the quarantine mail dialog to be able to see what mail address was "leaked".

Updated php-mime-mail-parser library to 5.1 to really fix webui html preview

Updated php-mime-mail-parser library to 5.0 to fix webui html preview

Preview versions of php-mime-mail-parser uses iconv for the most cases and iconv isn't properly supported in alpine php

[Compose] Update Dovecot image

Fixing #2555 by updating Dockerfile to use the correct dovecot.org url (and fixing the http 304 curl redirect problem)

Updating the www.dovecot.org/releases/... url to just dovecot.org/releases/... in dovecot Dockerfile to
prevent a http redirect problem with the curl ... | tar command.

[Web] Form cache for user passwd change modal disabled

[Compose] Update watchdog and remove oom check for compatibility

[Rspamd] Add missing spamassassin.conf