Rearranged solution, added CLARA.Shared project.

CLARA.Shared/CLARA.Shared.csproj

@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>netstandard2.0</TargetFramework>
+    </PropertyGroup>
+
+</Project>

CLARA.Shared/Utils.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace CLARA.Shared
+{
+    public static class Utils
+    {
+        public static string ToHex(this byte number)
+        {
+            return ((long)number).ToHex(2);
+        }
+        public static string ToHex(this int number, byte digits = 4)
+        {
+            return ((long)number).ToHex(digits);
+        }
+        public static string ToHex(this long number, byte digits = 4)
+        {
+            return string.Concat("#", Convert.ToInt64(number).ToString(string.Concat("X", digits.ToString())));
+        }
+    }
+}