Add ability to edit individual fields without the need to mass-edit all
fields.

Refer ticket to current assignee on reassignment
Refer ticket to current department on transfer

Add the initial concept of thread (tickets & tasks) referral.

* Agent & Team
Referring a ticket to an agent or team - is just like assignment without
actually assigning. If referred agent doesn't have access to the ticket's
department then they'll only have view access.

* Department
This is like assigning a ticket to the entire department. Meaning agents who
have access to the referred to department will now see the ticket - what
they can do with the ticket will depend on the assigned role in that
particular department.

It's important to note the ticket will technically be still the
responsibility of the primary department. Transferring the ticket is the
sure way to relinquishing the responsibility.

* Auto Department Referral via email
This will happen if an email is sent to multiple departments. For example an
email with TO: support &  CC: billing will result in the ticket getting
routed to "support" department and "billing" getting a referral of the same
ticket. This allows both departments to have visibility of the ticket -
which is not possible at the moment.

Refer ticket to current assignee on reassignment
Refer ticket to current department on transfer

Add the initial concept of thread (tickets & tasks) referral.

* Agent & Team
Referring a ticket to an agent or team - is just like assignment without
actually assigning. If referred agent doesn't have access to the ticket's
department then they'll only have view access.

* Department
This is like assigning a ticket to the entire department. Meaning agents who
have access to the referred to department will now see the ticket - what
they can do with the ticket will depend on the assigned role in that
particular department.

It's important to note the ticket will technically be still the
responsibility of the primary department. Transferring the ticket is the
sure way to relinquishing the responsibility.

* Auto Department Referral via email
This will happen if an email is sent to multiple departments. For example an
email with TO: support &  CC: billing will result in the ticket getting
routed to "support" department and "billing" getting a referral of the same
ticket. This allows both departments to have visibility of the ticket -
which is not possible at the moment.

This fixes an issue where the `$ht` variable is not properly initialized by
the ORM. It is assumed to be a valid array in the constructor, and its items
are run through the ::set() method. Therefore, if an empty array is
received, the `$ht` variable will remain null, since nothing is ever set.

This also fixes a misspelled variable in the claim dialog if a ticket is
currently assigned to a team only.

Updated several files to split up phrases like "Your lock has expired. Please try again!" into "Your lock has expiredx" and "Please try again!"

Note: Since I'm not sure if that's all (replacing %s %s with %1$s %2$s) which is necessary to make this work, I'm sorry in advance for a potential "bad commit".

As already written on Crowdin, in German the order is wrong, so my suggestion is to make it possible to change the order by transforming "%s %s" to "%1$s and %2$s".
Format in English: Successfully assigned 4 selected tasks
Needed German: Successfully 4 selected tasks assigned

Fix translation so it makes sense.
Before: "Unable to change status for 2 any of the selected tickets" - sounds wired
After: "Unable to change status of 2 selected tickets" - sounds correct and fits into the rest of the translation scheme ;)

This pass also makes a stride at adding correct punctuation and making error
phrases consistent.

This is my attempt at removing similar texts from the translator work load.
It also makes an attempt at dropping some misspelled words and works toward
standardizing some phrases.

Make tasks actions icon based buttons
Fix task assignment issue

Filter assignees based on selected tickets department setting.

Filter members based on department's assignment restriction when building a
list of assignees.

ClaimForm extends AssignmentForm and hides assignees selection. Claimant is
still given the opportunity to log an optional internal note as to why
they're claiming the ticket in question.

Let the object have full control the list of possible assignees

Due to MySQL FULLTEXT min-word-lenn requirements (which various from
installation to installation), fulltext-based searches require at least two
characters.

Otherwise we might end up with a search term like '"some junk"*' which is
invalid.

This time, use full-text for user and ticket lookup boxes, and drop the
full-table scans from the ticket basic search page. Auto promote searches to
wildcard searches when searching with the user-supplied input yields no
results.

Also, fix submission without a lock and locks are disabled

- Adds mass assign, transfer to ticket queues
- Retire inline forms for ticket assignment and transfer

- Tickets cannot be closed when an open ticket exists
- Tickets/Tasks cannot be closed when required for close fields are missing
data
- Add isCloseable routine to ticket/task classes

Initially, include support only for Gravatar

The setting is no longer ticket thread specific. Disabling html is now
system wide setting for disable-able textarea widgets as well as email
correspondence.