This addresses an issue where osTicket did not ensure associated items exist
before saving to the database. This also addresses an issue where the Parent
Topic error was not displayed on page.

Move orphaned tasks on department deletion to the default department

Fix bug brought about by commit #72e9abcf

In ::isMember(), there is now no reason that a call to ::getMembers() would
fail, so it can be assumed that a QuerySet instance is returned.

This commit updates a bunch of files and changes a lot of phrases. Basically it extracts "Internal error occurred" from existing phrases.
I've re-ordered the phrases so "Internal error occurred" is always at the end after the actual informative error message.

Example comparison before and after this commit:
Before: 1 Phrase: "Internal error: Unable to print to PDF"
After: 2 Phrases: "Unable to print to PDF." + "Internal error occurred"

* Separate primary from extended access members when listing department
  access.

* Add ability to update primary department members role

* Quick staff add - inherit role of the primary department as default role

Add ability get sorted department members. Extended members are sorted, annotated
and cached.

Consolidate agents name sorting in Staff::nsort. The routing expects a query
set.

isMember routine wrongly assumed getMembers returned staff_id indexed
hashtable.

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.

Previously, the create method was used to create a new instance of an orm
model (which would later result in an INSERT when persisted); however, some
classes require or utilize varying parameters to their create() method,
which PHP7 considers an error. Methods in subclasses must be defined with a
calling signature compatible with the parent class.

This patch shifts the concept of model creation to the constructor. Now, the
constructor of ORM models is required to be compatible with that of
ModelBase class. Now that most models do not define a constructor, this is
much easier to control, and much more logical.

Also, remove an issue where assignments on a relationship field to an
instance of a super class of the foreign model would raise an error. This
was previously addressed by re-classing the instance in the
ModelInstanceManager::getOrBuild(); however that design would create
multiple instances of the same object in memory, which defeats one of the
primary design concepts of the ORM. This patch addresses the issue by
allowing super-classes of the declared foreign model in relationship
assignments.

This commit attempts to remove all coding standard warnings emitted by PHP
7.0.

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

Add a checkbox option within the department setting to disable the "Claim on
Response"

Feature must be enabled globally in order to be disabled locally (duh!)

Department/Topic create now considers the possibility of preset id (primary key)
Default help topic routing to floating system's default department

* Set all "route department" filter actions to "unchanged"
* Fix bug in quick-add code where new option was not properly added

Reset permissions and change primary department and role

getVar() is now called first, then object properties and array properties
are considered, and then getTag() is considered if none of the other options
work. This allows for more predictable results using the variable
replacement system, and allows ::getVar() to override every other means to
use variables in email templates.

This is required with the connection to Dept::getEmail()->send(...)

The bug was partly due to switch to ORM.

* Fix crash saving a page (regression)
* Fix red banner deleting a department
* Fix crash deleting a knowledgebase article

If a relationship has more than one field in the constraint, then the
InstrumentedList query generated would not be correct. This happens often
in osTicket for the join foreign key fields `object_type` and `object_id`.

This patch addresses the issue by sending all the fields in the foreign key
to the InstrumentedList constructor.

Add support for passing a criteria to AssignmentField to limit  the choices
Limit assignees based on department settings
Cache choices

Unassign tickets on transfer when the target department has assignment
restriction and the assigned staff is not a member.

Disable claim (quick self-assignment) when above restriction is in effect.