Process inline attachments in thread entry and support inline images in
piped emails

Support inline images across the system, with draft support

Migrate to a single attachment table
    That way we don't need a new table for everything we need to attach an
    inline image to (like a signature, for instance)

Add richtext support for internal notes

Implement images on site pages

* Image paste in Redactor
* Make non-local images optional
* Placeholder for non-local images
* Fix local image download hover
* Don't re-attach inline images

The client and scp config ajax request only contain the settings for the
multi-file upload widget. So it doesn't need to be fetched unless the widget
exists on the page

Allows direct editing of XHTML code in the nicEdit pane

Remove default max limit - no size limit is assumed.

Remove ticket.min.js (users can minimize/compress files on thier own)

Add overlay + please wait spinner on form submit

Autosubmit form on load - refresh is called on submit giving it form object
Validate start/stop timeframe in the backend

Remove obsolete functions

Impove row highlighter on table listing.

Use locktime (reply form hidden input) to auto-detect if locking is enabled without the need to ping the backend

Update to fix issue #189: https://github.com/osTicket/osTicket-1.7/issues/189

Change header to match the new names

Add print options supports - staff can now print a ticket thread without internal notes + select paper size on the fly

And remove unnecessary parts of bootstrap.css

Protect againts cross-site request forgery attacks by requiring a special
form-field or header to be sent with requests that modify ticket system
data.

This meant a slight change to the AJAX ticket locking mechanism. It was
defined to lock with a GET request; however, GET requests are defined as
safe methods and should not modify backend data (such as a lock
acquisition). Therefore, the the lock acquire AJAX method was changed to
require a POST method.

Also remove old, no-longer-used staff panel include files

Most things work, still outstanding
  - the table needs to support filtering like the graphs,
  - the bootstrap.css file needs to be culled of what isn't used for now,
  - g.raphael needs to be re-minned after a issue is filed with g.raphael
    for the snapEnds() function not picking reasonable graph axes.
  - split dashboard.php into several smaller js, css, etc., respective files