Ticket status change

Reviewed-By: Jared Hancock <jared@osticket.com>

Add statuses and flags selection to advanced search

Reviewed-By: Jared Hancock <jared@osticket.com>

Fix search backend to use the new statuses

Always clear staff's drafts on successful reply
Remove errant reload

Choice fields :: fix several minor issues

Reviewed-By: Peter Rotich <peter@osticket.com>

Always support and consider multiple values — even using the typeahead
widget.

Always save a key/value hash of the selected value(s). However, if the field
does not have the multivalue configuration setting, then retrieve just the
key with the to_php() function. to_database(), however, will always return a
JSON string with the value(s) formatted as a hash array.

Custom Ticket Statuses

Custom configurations for plugins

Sorta-Reviewed-By: Peter Rotich <peter@osticket.com>

Staff can now select desired ticket status on create
Only allow staff with closing permission to set tickets to resolved state.

Make table prefix consistent

Cleanup status change form
Add resolve to ticket ticket view
Use the new status table when checking for overdue

Flags will be reimplemented as a separate feature.

Unify use of modal dialog
Make popup dialog graggable

Empty the popup container and show loading spinner
on-load hide the spinner and show the content

Delete tickets for realz when set to 'deleted' status. This commit will be
partially reverted once data retention plugin is added.

Statuses with tickets cannot be deleted
Fix orm to class gracefully when joins are not inspected
Add create date to new statuses

Reserve 'archived' state for automation

This allows for subclasses to define how the choice is formatted.
Split ticket status states into public and private

Fix cases where first item added via addSubMenu got deleted.

Move ticket status change to unified backend.

If a comment is provided it's handled as an internal note - allowing for
alerts to be sent out (if enabled)

Messages are extracted on post-action redirect.