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

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

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+
+namespace ChristianHelle.DeveloperTools.CodeGenerators.Resw.VSPackage.CustomTool
+{
+    public interface IResourceParser
+    {
+        string ReswFileContents { get; set; }
+        List<ResourceItem> Parse();
+    }
+}