Modify Reopen Assignment

issue: Format File Name

This commit modifies the code to ensure that if the 'Disable auto assign on reopen' box is checked for a department, reopened tickets are open as unassigned when a ticket is reopened by a user's message as well as when an agent manually reopens the ticket.

issue: DB Error #1062

This formats the filename before using it in an error to avoid chance of
XSS.

This addresses a long-time issue of the famous `DB Error #1062` when
uploading an Inline File to a Draft. The issue is that the system does not
check if an Attachment record exists before creating a new one. We create a
new Attachment record, we go to save it, and the system errors out because
that record already exists. This adds a check to see if the Attachment
record already exists and if so we use that instead of creating a new one.

Issue: Edit Task Fields

issue: In-Reply-To Header

This commit fixes an issue where you were unable to edit custom fields if they were added to a task form after a task had been created.

issue: Delete Org Session Failure

This addresses an issue raised in 5111 where the `in-reply-to` header is not
sent with outgoing emails. This is due to the `$recipients` variable being
an instance of `MailingList` which is not handled correctly in
`class.mailer.php`. This adds a new case to handle `MailingList` directly.

issue: Attachment Filter

issue: Umlauts In Sender's Name

issue: Umlauts In Subject

This addresses an ORM failure where upon refetching an object from the
database that no longer exists the system crashes hard. We use the `one()`
method which expects one result, if there is no result it throws a
`DoesNotExist` exception. We are not catching the exception properly which
crashes osTicket and forces you to clear the session via browser or
database.

This addresses an issue on the Forum where deleting an Organization causes
the session to fail. This is due to the Organization QuerySet being stored
in the session and not being cleared out when deleted from the system. This
causes the system to try to refetch the object from the database which it's
not there as it's been deleted and therefore causes the session to crash.

This addresses issue 5123 where fetched Emails do not reject attachments
that are not allowed. This is due to setting a File ID inside of an array
called `$file[]` but not unsetting it when the attachment hits an
FileUploadError. This updates class MailFetch to set the file array back to
empty so that the ID is cleared and the error is added correctly which
rejects the attachment.

This addresses an issue where Piping email to osTicket and having Umlauts in
the Subject line causes the Subject to be malformed. This is due to the
`mimedecode()` method for class Format which is used by the API to transcode
the Subject line in emails. This adds a check to see if the
`mb_detect_encoding()` method exists so we can detect the value's encoding.
If it exists and we can detect the value's encoding the system will
transcode the text from the detected encoding to UTF-8. If we cannot detect
the encoding the text will continue through the other encoding checks.

This addresses issue 4884 where sending an email with Umlauts in the From
Name causes the User's Name and Email to be malformed. This is due to
outdated RFC822 from Pear. This replaces the old RFC822 Pear module with the
latest release so that we are up to date.

Fix use of possibly uninitialised $_SERVER['HTTPS']

i18n: KnowledgeBase Category and JS

issue: Spaces In Username

This addresses issue 5122 where having a space at the beginning and/or end
of the login Username/Email on the Client Portal the system will return
`Access Denied`. This is due to the system not trimming the rogue spaces.
This adds `trim()` around the Username/Email so that the spaces are removed
and login will be successful.

In 5120, the reporting party also mentioned that they receive an error of
`script '/xxx/osTicket/kb/ajax.php' not found or unable to stat`.  This is
due to the AJAX call being inside the KB directory, and `/kb/ajax.php` truly
does not exist. This adds `ROOT_PATH` to the beginning of the AJAX call so
that no matter where it is, it will point to the correct location.

This addresses 5120 where main (or Parent) FAQ Category Titles are not
translated even though the child Category titles are translated correctly.
This is due to to the system pulling the Full Name instead of the Local
(translated) Name.

i18n: OpenSSL Error

Make message variable (%{message}) optional

This addresses issue 5095 where installing a Language Pack and visiting the
Dashboard > Information page without OpenSSL installed/configured will throw
a fatal error of `Call to undefined function openssl_pkey_get_public()`.
This is due to no check for the `openssl` extension before the dependant
method is called. This adds a check so that if OpenSSL is not available we
can return a useful error code of `VERIFY_EXT_MISSING` (which is error code
`2`) and continue without disrupting the content.

Make message variable optional for new tickets opened by agents. This is
necessary for help topics with issue details disabled.

Datatimepicker: Time format

This commit addresses an issue where time format in 24 hrs resulted in
double hours.

issue: Revert  fefed147

issue: ACL Oopsie

This addresses an issue where initially saving the ACL will fail. This is
due to the incorrect variable being used to lookup the IP in the ACL. This
updates the variable from `$acl` to the correct variable `$vars['acl']`.

This addresses issue 5084 by partially reverting commit `fefed147`. In said
commit, we updated `THIS_VERSION` to utilize `MAJOR_VERSION` which is fine.
However, we also updated the deploy module to copy the same format. This
interferes with the osTicket Version check by not including the entire
subversion and not starting with a `v` (ie. `v1.12.3`). This reverts the
copied format section of the commit so that `THIS_VERSION` will be the full,
non-git version when deployed/packaged.

issue: Mbstring Extension Requirement

This addresses an issue reported on the forum where printing a ticket in
v1.12 and above requires `mbstring`. This updates the print call to check
for the `mbstring` extension and if not loaded will fail with a detailed
error `mbstring extension required to print ticket to PDF`.

Instantiate  StaffDeptAccess