Made progress on implementing some shops.

Performed some folder restructuring as well.

Props-Modules/Props.Shop/Ebay/Options/SandboxOption.cs

@@ -0,0 +1,35 @@
+using System;
+using Props.Shop.Framework;
+
+namespace Props.Shop.Ebay
+{
+    public class SandboxOption : IOption
+    {
+        private Configuration configuration;
+        public string Name => "Ebay Sandbox";
+
+        public string Description => "For development purposes, Ebay Sandbox allows use of Ebay APIs (with exceptions) in a sandbox environment before applying for production use.";
+
+        public bool Required => true;
+
+        public Type Type => typeof(bool);
+
+        internal SandboxOption(Configuration configuration)
+        {
+            this.configuration = configuration;
+        }
+
+        public string GetValue()
+        {
+            return configuration.Sandbox.ToString();
+        }
+
+        public bool SetValue(string value)
+        {
+            bool sandbox = false;
+            bool res = bool.TryParse(value, out sandbox);
+            configuration.Sandbox = sandbox;
+            return res;
+        }
+    }
+}