Fixes #980

And use admin-defined site logo

Change thread entry title bar to use more flexible layout using div's and
span's in hopes of avoiding unnecessary wrapping -- especially in the poster
name column..

And also fix font display for <pre> sections created from plain/text thread
posts

Fixes oversize image display to be resized in both the ticket thread and
the redactor editor in (at least)

  * Ticket-view boxes
  * Client new-ticket form
  * Staff new ticket
  * Page add/edit
  * FAQ add/edit
  * Canned response add/edit

Fixes osTicket/osTicket-1.8#247

Previously list items rendered outside the thread-body table cell

Fix width of the ticket thread body
Add consistent font styling between Redactor and thread body

  * Upgrade to Redactor 9.1.7
  * Use a (x) icon from font-awesome for the dialog

PHP can't discern the difference between d/m/Y and m/d/Y when just the date
is submitted to strtotime(). Unfortunately, strptime() is not available
until PHP 5.1.0. This patch forces datepickers to change their values to
YYYY-MM-DD upon submission to disambiguate parsing issues.

Fixes #832