Complex types fixes (#978)

fix #940 and #975 
- add namespace qualifier to complex type name
- improve handling of known subtypes
- fix Pss detection on .Net 462
- stronger check of valid DataTypeDefinition for servers which expose invalid structure (nodejs)

Stack/Opc.Ua.Core/Security/Certificates/RsaUtils.cs

@@ -388,7 +388,7 @@ namespace Opc.Ua
         /// Lazy helper to allow runtime to check for Pss support.
         /// </summary>
         internal static readonly Lazy<bool> IsSupportingRSAPssSign = new Lazy<bool>(() => {
-#if NET46 || NET461 || NET47
+#if NET46 || NET461 || NET462 || NET47
             // The Pss check returns false on .Net4.6/4.7, although it is always supported with certs.
             // but not supported with Mono
             return !Utils.IsRunningOnMono();
@@ -417,6 +417,6 @@ namespace Opc.Ua
                 rsa.Dispose();
             }
         }
-#endregion
+        #endregion
     }
 }