Removed System.Windows.Forms dependancy from Common. Almost done removing NLog dependancy.

MediaBrowser.Common/Kernel/IApplicationHost.cs

@@ -0,0 +1,19 @@
+
+namespace MediaBrowser.Common.Kernel
+{
+    /// <summary>
+    /// An interface to be implemented by the applications hosting a kernel
+    /// </summary>
+    public interface IApplicationHost
+    {
+        /// <summary>
+        /// Restarts this instance.
+        /// </summary>
+        void Restart();
+
+        /// <summary>
+        /// Reloads the logger.
+        /// </summary>
+        void ReloadLogger();
+    }
+}