Making the Sql Syntax Providers public and changing a few names and bits for consistency.

Adding resolver for the syntax providers and wiring it up in the boot manager.

src/Umbraco.Tests/TestHelpers/BaseDatabaseFactoryTest.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Collections.Generic;
+using System.ComponentModel;
 using System.Configuration;
 using System.Data.SqlServerCe;
 using System.IO;
@@ -64,6 +66,9 @@ namespace Umbraco.Tests.TestHelpers
             RepositoryResolver.Current = new RepositoryResolver(
                 new RepositoryFactory());
 
+            SqlSyntaxProvidersResolver.Current = new SqlSyntaxProvidersResolver(
+                new List<Type>{ typeof(MySqlSyntaxProvider), typeof(SqlCeSyntaxProvider), typeof(SqlServerSyntaxProvider) }) { CanResolveBeforeFrozen = true};
+
             //Get the connectionstring settings from config
             var settings = ConfigurationManager.ConnectionStrings[Core.Configuration.GlobalSettings.UmbracoConnectionName];
             ConfigurationManager.AppSettings.Set(Core.Configuration.GlobalSettings.UmbracoConnectionName, @"datalayer=SQLCE4Umbraco.SqlCEHelper,SQLCE4Umbraco;data source=|DataDirectory|\UmbracoPetaPocoTests.sdf");
@@ -100,14 +105,15 @@ namespace Umbraco.Tests.TestHelpers
 			//reset the app context            
 			ApplicationContext.ApplicationCache.ClearAllCache();
 
-            SyntaxConfig.SqlSyntaxProvider = null;
-
+            SqlSyntaxContext.SqlSyntaxProvider = null;
+            
 			//legacy API database connection close - because a unit test using PetaPoco db-layer can trigger the usage of SqlHelper we need to ensure that a possible connection is closed.
 			SqlCeContextGuardian.CloseBackgroundConnection();
 			
 			ApplicationContext.Current = null;
 			Resolution.IsFrozen = false;
 			RepositoryResolver.Reset();
+            SqlSyntaxProvidersResolver.Reset();
 
             TestHelper.CleanContentDirectories();