real instance object like IContent, this will dramatically increase performance for bulk publishing when not
in a load balanced environment. Updated methods on DistributedCache to refresh many instances at one time, this also
means we're not re-looking it back up again. Need to update media, users, templates, members and macros to use this new feature too.
a couple of library cache clearing methods and moves them to CacheHelperExtensions. Fixes #U4-1653 for 6.1 and updates ExamineEvents to
ensure that Examine re-indexes media on all of the correct events (including Trashed). Changes for Caching are being done to begin work with
CD-148
