Got new MemberGroupService done, completed the MemberService for role based stuff, created a member group cache refresher since we are caching member groups by name (probably should cache others too). Public access stuff changes if a name of a member group is changed which is now done with an event instead of coded into the biz logic.

src/Umbraco.Core/Persistence/RepositoryFactory.cs

@@ -166,7 +166,7 @@ namespace Umbraco.Core.Persistence
 
         internal virtual IMemberGroupRepository CreateMemberGroupRepository(IDatabaseUnitOfWork uow)
         {
-            return new MemberGroupRepository(uow, _disableAllCache ? (IRepositoryCacheProvider)NullCacheProvider.Current : RuntimeCacheProvider.Current);
+            return new MemberGroupRepository(uow, _disableAllCache ? (IRepositoryCacheProvider)NullCacheProvider.Current : RuntimeCacheProvider.Current, _cacheHelper);
         }
 
         internal virtual IEntityRepository CreateEntityRepository(IDatabaseUnitOfWork uow)