media types, also ensures that the route cache is cleared (#U4-1969). Changes the deletion of media and
doc types to use the new Api - this ensures that cache is refreshed properly.
to be lazy since the db context isn't initialized yet (will speed up start a bit too), ensures that the macro/xslt caching
clearing is only done on the single server instead or re-posing another distributed call.
in code. Unit tests for CacheHelper, unit tests for umbraco.macro, updates to
ObjectExtensions.TryConvertTo + unit tests, enhanced disposable method of ApplicationContext.
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.
