添加关闭窗口快捷键

src/include/xcb.h

@@ -58,6 +58,10 @@ void raise_window(xcb_window_t window);
  * @brief 在堆叠顺序中将 window 置于 sibling 之下
  */
 void place_window_below_sibling(xcb_window_t window, xcb_window_t sibling);
+/**
+ * @brief 关闭窗口并清理资源
+ */
+void kill_window(xcb_window_t window);
 
 typedef struct bar_cairo_params_t {
   xcb_connection_t *conn;