This addresses a fatal error when adding a new response to a Task with
Collaborators. When we implemented the MailingList for Users/Collaborators
we forgot about the little Task Collaborators (poor little guys). This adds
a new function called `getRecipients()` to `class Thread` that utilizes
MailingList instead of UserList. This also adds two new functions to `class
Util` that retrieves the User’s `user_id`.

Peter approved merge

- Make sure we only set Filter Flags if they need to be changed (don't update them every time we save)
- Make sure we sure we use the email_id if we have actually set it. Otherwise, we lose what should be set for the Target Channel

Clarify User Import Instructions

This commit updates the instructions for User imports letting the Agent know they should type 'Name, Email' on the first line and then put each new User Name/Email on the following lines to import Users.

oops: markAs() Typo

issue: markAs() elseif

This addresses an issue where Department Managers would not see the option
for Marking tickets as (un)answered due to an elseif (should be an if
instead).

This addresses a typo in the `markAs()` function in `ajax.tickets.php`. DOH!
Should’ve ran the lint tests

feature: Public Mark As Answered/Unanswered

This feature extends the ability to mark tickets as Answered/Unanswered to
any Agent with the Role Permission to Post Reply in the Department. This
also adds the ability to add an (optional) Internal Note when marking as
(un)answered.

feature: Complete Thread Variable

Support using %{ticket.thread} to export the entire ticket thread
correspondence between agents and end users (owner + collaborators).

Field: Help Topic Forms

Don't show fields disabled by help topic
Pass create mode for pre-selected help topic forms

Forms: Field Permissions

issue: FAQ/Page Attachments

This commit addresses inconsistencies on how field edit rights and
visibility are are handled.

This addresses an issue where inserting images on a Page or FAQ and having
the setting enabled for "Login required to view attachments." does not
display the images at all when the Page/FAQ renders in view. This is due to
the Page/FAQ update functions that were not updated to fit the new
`id=>name` format for `keepOnlyFileIds()` introduced with `f179cf15`.

issue: Email Default Dept

issue: create_date Variable

This addresses an issue where the create_date variable is showing as Unix
timestamp instead of formatted date. This was due to a typo introduced in
commit `8623ed60` where the `$format` argument was forgotten for
`Format::datetime()` in the `FormattedLocalDate::getVar()` method.

This addresses an issue where configuring a System Email to have a
Department and then editing/saving changes on the configured Department will
change the System Email's Department back to the the default Department.
This was due to a un-needed Department Status check introduced with commit
`1d361b51`. This also updates all instances of Dept Status comparison to be
case insensitive and non-translated.

Deleting the Default Queue

queue: Top-Level Ticket Counts

FileUploadField Validation

This commit fixes an issue where Agents were able to delete their default queue which then prevented them from going to any queue upon logging in. Now, they will see an error message if they try to do so.

Status Column: Fix display and sorting

This adds a setting in the Ticket Settings to give the option of showing the
ticket counts on Top-Level queues. If enabled, this will populate the ticket
counts next to the Top-Level queue names like they used to be. The only
caveat is the counts are triggered by mousing-over any of the queue names as
we only load the counts when we need to display the sub-queues (for better
performance).

This also adds a new format function called `number` (Phase 1). As of now it
will format any integer to a comma separated number (eg. `1337 -> 1,337`).

Dashboard Statistics Issue

This commit addresses an issue where we lost the logic for needed GROUP BYs in the dashboard report. They were added back for the Statistics query but not for the query that calculates Response and Service time. This now adds it back.

issue: Queue sort_id

This commit addresses where wrong "primary" field was used to indicate
Ticket Status column. It also fixes an issue where sorting was done via `id`
instead of `name`.

This commits adds a flag to skip validation on $field->getClean() routine.
This is necessary to allow FileUploadField to fetch "injected" files.

This addresses an issue where poor little `sort_id` was sadly forgotten for
the two main-level queues "Open" and "My Tickets".

issue: ticket_link Fatal Error

Queue counts

This addresses an issue where replying to a ticket causes a Fatal Error for
the system. This is due to the `$ticket` object not being set before the
else statement therefore causing the `getId()` function to fail. This breaks
down the if/else statement to make sure the `$ticket` object is in-fact set
before continuing.