refactor handlers.{c,h}: declare the handlers static, remove unnecessary parameters

include/click.h

@@ -1,9 +1,9 @@
 /*
- * vim:ts=8:expandtab
+ * vim:ts=4:sw=4:expandtab
  *
  * i3 - an improved dynamic tiling window manager
  *
- * © 2009 Michael Stapelberg and contributors
+ * © 2009-2011 Michael Stapelberg and contributors
  *
  * See file LICENSE for license information.
  *
@@ -11,6 +11,14 @@
 #ifndef _CLICK_H
 #define _CLICK_H
 
-int handle_button_press(void *ignored, xcb_connection_t *conn, xcb_button_press_event_t *event);
+/**
+ * The button press X callback. This function determines whether the floating
+ * modifier is pressed and where the user clicked (decoration, border, inside
+ * the window).
+ *
+ * Then, route_click is called on the appropriate con.
+ *
+ */
+int handle_button_press(xcb_button_press_event_t *event);
 
 #endif