Removes more unecessary singletons and simplifies/refactors some internal parts like the ctors for the ServiceContext, DatabaseContext. No more RepositoryResolver or SqlSyntaxProvidersResolver these are entirely uncessary and complicate things.

src/Umbraco.Tests/Persistence/Repositories/MemberRepositoryTest.cs

@@ -112,19 +112,6 @@ namespace Umbraco.Tests.Persistence.Repositories
         }
 
 
-        [Test]
-        public void Can_Instantiate_Repository_From_Resolver()
-        {
-            // Arrange
-            var provider = new PetaPocoUnitOfWorkProvider(Logger);
-            var unitOfWork = provider.GetUnitOfWork();
-
-            // Act
-            var repository = RepositoryResolver.Current.ResolveByType<IMemberRepository>(unitOfWork);
-
-            // Assert
-            Assert.That(repository, Is.Not.Null);
-        }
 
         [Test]
         public void MemberRepository_Can_Get_Member_By_Id()