Create VSIX package and move all custom tool code into the VSPackage project

RESW File Code Generator/VSPackage/CustomTool/ClassNameExtractor.cs

@@ -0,0 +1,16 @@
+using System.IO;
+
+namespace ChristianHelle.DeveloperTools.CodeGenerators.Resw.VSPackage.CustomTool
+{
+    public static class ClassNameExtractor
+    {
+        public static string GetClassName(string wszInputFilePath)
+        {
+            if (!File.Exists(wszInputFilePath))
+                throw new FileNotFoundException();
+
+            var fileInfo = new FileInfo(wszInputFilePath);
+            return fileInfo.Name.Replace(fileInfo.Extension, string.Empty);
+        }
+    }
+}