Fix Alt+Space hotkey affect by system

if no disable control box,  sometimes awake Wox with alt+space hotkey,
the first input key is swallowed by system

Wox/Helper/WindowIntelopHelper.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+namespace Wox.Helper
+{
+    public class WindowIntelopHelper
+    {
+        private const int GWL_STYLE = -16; //WPF's Message code for Title Bar's Style 
+        private const int WS_SYSMENU = 0x80000; //WPF's Message code for System Menu
+
+        [DllImport("user32.dll", SetLastError = true)]
+        private static extern int GetWindowLong(IntPtr hWnd, int nIndex);
+
+        [DllImport("user32.dll")]
+        private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
+
+        /// <summary>
+        /// disable windows toolbar's control box
+        /// this will also disable system menu with Alt+Space hotkey
+        /// </summary>
+        public static void DisableControlBox(Window win)
+        {
+            var hwnd = new System.Windows.Interop.WindowInteropHelper(win).Handle;
+            SetWindowLong(hwnd, GWL_STYLE, GetWindowLong(hwnd, GWL_STYLE) & ~WS_SYSMENU);
+        }
+    }
+}