Simplifies clearing cache for macro's all is done via the DistributedCache.Instance - hopefully all cache will be invalidated

via this method so that all cache types are simply invalidated with ICacheRefreshers and ApplicationEventHandlers. Currently we
have calls to clear cache in zillions of places and its near impossible to tell where/when it currently happens.

src/Umbraco.Web/Cache/DistributedCacheExtensions.cs

@@ -0,0 +1,79 @@
+using System;
+
+namespace Umbraco.Web.Cache
+{
+    /// <summary>
+    /// Extension methods for DistrubutedCache
+    /// </summary>
+    public static class DistributedCacheExtensions
+    {
+        /// <summary>
+        /// Refreshes the cache amongst servers for a template
+        /// </summary>
+        /// <param name="dc"></param>
+        /// <param name="templateId"></param>
+        public static void RefreshTemplateCache(this DistributedCache dc, int templateId)
+        {
+            dc.Refresh(new Guid(DistributedCache.TemplateRefresherId), templateId);
+        }
+
+        /// <summary>
+        /// Refreshes the cache amongst servers for all pages
+        /// </summary>
+        /// <param name="dc"></param>
+        public static void RefreshAllPageCache(this DistributedCache dc)
+        {
+            dc.RefreshAll(new Guid(DistributedCache.PageCacheRefresherId));
+        }
+
+        /// <summary>
+        /// Refreshes the cache amongst servers for a page
+        /// </summary>
+        /// <param name="dc"></param>
+        /// <param name="pageId"></param>
+        public static void RefreshPageCache(this DistributedCache dc, int pageId)
+        {
+            dc.Refresh(new Guid(DistributedCache.PageCacheRefresherId), pageId);
+        }
+
+        /// <summary>
+        /// Removes the cache amongst servers for a page
+        /// </summary>
+        /// <param name="dc"></param>
+        /// <param name="pageId"></param>
+        public static void RemovePageCache(this DistributedCache dc, int pageId)
+        {
+            dc.Remove(new Guid(DistributedCache.PageCacheRefresherId), pageId);
+        }
+
+        /// <summary>
+        /// Refreshes the cache amongst servers for a member
+        /// </summary>
+        /// <param name="dc"></param>
+        /// <param name="memberId"></param>
+        public static void RefreshMemberCache(this DistributedCache dc, int memberId)
+        {
+            dc.Refresh(new Guid(DistributedCache.MemberCacheRefresherId), memberId);
+        }
+
+        /// <summary>
+        /// Refreshes the cache amongst servers for a media item
+        /// </summary>
+        /// <param name="dc"></param>
+        /// <param name="mediaId"></param>
+        public static void RefreshMediaCache(this DistributedCache dc, int mediaId)
+        {
+            dc.Refresh(new Guid(DistributedCache.MediaCacheRefresherId), mediaId);
+        }
+
+        /// <summary>
+        /// Refreshes the cache amongst servers for a macro item
+        /// </summary>
+        /// <param name="dc"></param>
+        /// <param name="macroId"></param>
+        public static void RefreshMacroCache(this DistributedCache dc, int macroId)
+        {
+            dc.Refresh(new Guid(DistributedCache.MacroCacheRefresherId), macroId);
+        }
+    }
+}