Removed relationship between users and applications and got back to a compiling state.

Set up editing screens for group/node permissions.

src/Umbraco.Core/Cache/CacheKeys.cs

@@ -58,6 +58,8 @@ namespace Umbraco.Core.Cache
         
         public const string UserPermissionsCacheKey = "UmbracoUserPermissions";
 
+        public const string UserGroupPermissionsCacheKey = "UmbracoUserGroupPermissions";
+
         [UmbracoWillObsolete("This cache key is only used for legacy business logic caching, remove in v8")]
         public const string ContentTypeCacheKey = "UmbracoContentType";