Move some internal types to engine DLL.

Author: sharpjs

…sts.Unit/SqlErrorHandlingBuilderTests.cs …ne.Tests/SqlErrorHandlingBuilderTests.csPSql.Tests/Tests.Unit/SqlErrorHandlingBuilderTests.cs renamed to PSql.Engine.Tests/SqlErrorHandlingBuilderTests.cs PSql.Tests/Tests.Unit/SqlErrorHandlingBuilderTests.cs renamed to PSql.Engine.Tests/SqlErrorHandlingBuilderTests.cs

@@ -87,7 +87,7 @@ protected override void ProcessRecord()
 
         // Execute with optional error handling
         if (ShouldUseErrorHandling)
-            Execute(SqlErrorHandling.Apply(scripts));
+            Execute(E.SqlErrorHandling.Apply(scripts));
         else
             Execute(scripts);
     }