Fix a global hotkey issues in CMD, which will hang Wox on init.

Wox.Plugin/EventHandler.cs

@@ -8,6 +8,15 @@ namespace Wox.Plugin
 {
     public delegate void WoxKeyDownEventHandler(object sender, WoxKeyDownEventArgs e);
 
+    /// <summary>
+    /// Global keyboard events
+    /// </summary>
+    /// <param name="keyevent">WM_KEYDOWN = 256,WM_KEYUP = 257,WM_SYSKEYUP = 261,WM_SYSKEYDOWN = 260</param>
+    /// <param name="vkcode"></param>
+    /// <param name="state"></param>
+    /// <returns>return true to continue handling, return false to intercept system handling</returns>
+    public delegate bool WoxGlobalKeyboardEventHandler(int keyevent, int vkcode, SpecialKeyState state);
+
     public class WoxKeyDownEventArgs
     {
         public string Query { get; set; }

Wox.Plugin/IPublicAPI.cs

@@ -41,5 +41,7 @@ namespace Wox.Plugin
         List<PluginPair> GetAllPlugins();
 
         event WoxKeyDownEventHandler BackKeyDownEvent;
+
+        event WoxGlobalKeyboardEventHandler GlobalKeyboardEvent;
     }
 }