Redirect to recent queue / listing on transfer or assign

Disable pjax on task print

- 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

Add danger to delete actions.

Revert this commit once fixed.

* 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>

Add multiple sticky bars support
Make scroll-up automated and independent

Move collaboration implementation to thread level

Add a tab for tasks
Add mass action for tasks

This patch converts the central file and threading classes over to use the
ORM.

Allow for permissions to be registered dynamically. This will
allow for the ability for models and plugins to register permissions.

Add ability to add tasks to tickets.

Introduce the initial concept of adding tasks to a ticket.