Prepare for nullable annotations.

Author: bgrainger

src/MySqlConnector/Authentication/AuthenticationPlugins.cs

@@ -1,3 +1,4 @@
+#nullable disable
 using System;
 using System.Collections.Generic;
 

src/MySqlConnector/Authentication/IAuthenticationPlugin.cs

@@ -1,3 +1,4 @@
+#nullable disable
 using System;
 
 namespace MySqlConnector.Authentication

src/MySqlConnector/Core/BatchedCommandPayloadCreator.cs

@@ -1,3 +1,4 @@
+#nullable disable
 using System;
 using System.Buffers.Binary;
 using System.Collections.Generic;

src/MySqlConnector/Core/BinaryRow.cs

@@ -1,3 +1,4 @@
+#nullable disable
 using System;
 using System.Buffers.Text;
 using System.Runtime.InteropServices;

src/MySqlConnector/Core/CachedParameter.cs

@@ -1,3 +1,4 @@
+#nullable disable
 using System;
 using System.Data;
 using MySql.Data.MySqlClient;

src/MySqlConnector/Core/CachedProcedure.cs

@@ -1,3 +1,4 @@
+#nullable disable
 using System;
 using System.Collections.Generic;
 using System.Data;

src/MySqlConnector/Core/ColumnTypeMetadata.cs

@@ -1,3 +1,4 @@
+#nullable disable
 using MySql.Data.MySqlClient;
 
 namespace MySqlConnector.Core

src/MySqlConnector/Core/CommandExecutor.cs

@@ -1,3 +1,4 @@
+#nullable disable
 using System;
 using System.Collections.Generic;
 using System.Data;

src/MySqlConnector/Core/CommandListPosition.cs

@@ -1,3 +1,4 @@
+#nullable disable
 using System.Collections.Generic;
 
 namespace MySqlConnector.Core

src/MySqlConnector/Core/ConcatenatedCommandPayloadCreator.cs

@@ -1,8 +1,5 @@
-using System;
+#nullable disable
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using MySqlConnector.Logging;
 using MySqlConnector.Protocol;
 using MySqlConnector.Protocol.Serialization;