Added Global Keyboard Hook for refreshing using Ctrl+Shift+3

Created a Jna Global Keyboard Hook class and added hot key for
refreshing the windows xml (Ctrl + Shift + 3).
Fixed cancel button to dispose window properly.

src/org/synthuse/WinPtr.java

@@ -1,3 +1,10 @@
+/*
+ * Copyright 2014, Synthuse.org
+ * Released under the Apache Version 2.0 License.
+ *
+ * last modified by ejakubowski7@gmail.com
+*/
+
 package org.synthuse;
 
 import com.sun.jna.platform.win32.WinDef.HWND;