Redirect to recent queue / listing on transfer or assign

Utilize the same template for tickets and tasks queues

Disable pjax on task print

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

And two flags, one which signals that stored HTML is correctly balanced and
does not need to be balanced when rendered in the ticket view. The second is
used to signal messages received from collaborators.

Additionally, this patch fixes showing external inline images (via the [Show
Images] button) when clicked.

Implement generic get dynamic fields lookup routines

- 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

This patch shores up the new list management feature with the custom list
handler feature written to support lists being saved in a table other than
%list_item, namely the built-in ticket status list.

Also squelch the 'You sure?' popup appearing multiple times.

Restrict view access depending on agent's perm.

* Make the "Items" tab the default
* Drop the "Showing ..." text and add a count to the items tab
* Redirect to "Items" tab when creating a new list
* Add a new list item by ajax rather than refresh

Add danger to delete actions.

Revert this commit once fixed.

Support edit/update of dynamic data

* Preserve external storage flag on field configuration
* User gridlayout to render task's forms
* Use new roles for task's nav

Credit: Jared Hancock <jared@osticket.com>