Fix some sonar warnings.

Author: networkfusion

nanoFramework.Aws.IoTCore.Devices/AwsSignatureVersion4/nfArrayListExtensions.cs renamed to nanoFramework.Aws.IoTCore.Devices/AwsSignatureVersion4/NanoArrayListExtensions.cs

@@ -8,7 +8,7 @@ namespace System.Collections
     /// <summary>
     /// Extension methods used for canonicalization.
     /// </summary>
-    public static class nfArrayListExtensions
+    public static class NanoArrayListExtensions
     {
         /// <summary>
         /// Sort an ArrayList

nanoFramework.Aws.IoTCore.Devices/AwsSignatureVersion4/nfOrdinalComparer.cs renamed to nanoFramework.Aws.IoTCore.Devices/AwsSignatureVersion4/NanoOrdinalComparer.cs

@@ -44,7 +44,7 @@ public abstract class SignerBase
 
         // algorithm used to hash the canonical request that is supplied to
         // the signature computation
-        internal static SHA256 CanonicalRequestHashAlgorithm = SHA256.Create();
+        internal static readonly SHA256 CanonicalRequestHashAlgorithm = SHA256.Create();
 
         /// <summary>
         /// The service endpoint, including the path to any resource.

nanoFramework.Aws.IoTCore.Devices/AwsSignatureVersion4/nfStringComparer.cs renamed to nanoFramework.Aws.IoTCore.Devices/AwsSignatureVersion4/NanoStringComparer.cs

@@ -31,10 +31,10 @@
   </PropertyGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.props" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.props')" />
   <ItemGroup>
-    <Compile Include="AwsSignatureVersion4\nfArrayListExtensions.cs" />
+    <Compile Include="AwsSignatureVersion4\NanoArrayListExtensions.cs" />
     <Compile Include="AwsSignatureVersion4\HMACSHA256.cs" />
-    <Compile Include="AwsSignatureVersion4\nfOrdinalComparer.cs" />
-    <Compile Include="AwsSignatureVersion4\nfStringComparer.cs" />
+    <Compile Include="AwsSignatureVersion4\NanoOrdinalComparer.cs" />
+    <Compile Include="AwsSignatureVersion4\NanoStringComparer.cs" />
     <Compile Include="AwsSignatureVersion4\SHA256.cs" />
     <Compile Include="CloudToDeviceMessage.cs" />
     <Compile Include="ConfirmationStatus.cs" />