Custom Logo handling is unnecessary in RT 4
Remove "quick search" and queue summary overlays in favor of callback

Preserves the removal of the link to /Prefs/Quicksearch.html via CSS.

The LinkBuilders callbacks require the 4.0/queue-summary-link-callbacks
RT branch, and preserve the custom links to /Dist/Display.html instead
of /Search/Results.html.  Without the callbacks, we'll need to overlay
the entire files.
Replace custom SelectOwner with the $AutocompleteOwnersForSearch option

The option forces autocomplete for any cases which would generate a huge
dropdown.  The upshot of this is that when editing individual tickets,
a nice dropdown is available!
Keep most of rt.cpan.org's config in this extension

Now only site-specific values like passwords and database hosts can be
in a private RT_SiteConfig.pm.
Replace SelectQueue with an autocompleting text input
Allow editing of quicksearch preferences again, thanks to an RT patch

The patch is from the RT branch 4.0/quicksearch-prefs-callback.
Add the patch needed by 255217f