Add an argument to the callbacks to pass the xevent context, button or

key press. This allows to remove a few hacks to duplicate functions only
for behaviour changes; now differing behaviours are pushed down to the
callback. Also will allow for previously unavailable actions to be bind-able
down the road.

xevents.c

@@ -244,7 +244,7 @@ xev_handle_buttonpress(XEvent *ee)
 			return;
 	}
 
-	(*mb->callback)(cc, &mb->argument);
+	(*mb->callback)(cc, &mb->argument, CWM_BTN);
 }
 
 static void
@@ -298,7 +298,7 @@ xev_handle_keypress(XEvent *ee)
 			return;
 	}
 
-	(*kb->callback)(cc, &kb->argument);
+	(*kb->callback)(cc, &kb->argument, CWM_KEY);
 }
 
 /*