Whitespace fixes
Fix some more compiler warnings
key_grabber: Add timestamp to set_active function:

 * Tilda was exhibiting buggy behaviour when communicating
   with the X system. In the window manager when code was
   called that was setting the window to active, the window
   manager would loo the following message:

   > ... Buggy client sent a _NET_ACTIVE_WINDOW message
   > with a timestamp of 0 ...

 * The reason for this, was the function
       tilda_window_set_active(...)
   did not pass the right timestamp in the event
   structure that gets send to the X system. It
   was making a call to the function
       tomboy_keybinder_get_current_event_time()
   which would only return the correct timestamp,
   I the code was currently in a keybinding callback.
   However the function to set the window active can also
   be called from a mouse_enter signal handler, in which
   case the timestamp was always zero.

 * This patch fixes the issue by getting the right timestamp from
       gdk_get_current_event_time()
Events: Use GDK_EVENT_[PROPAGATE|STOP] macros
tomboykeybinder: cleanup filter_func
Fix compiler warnings by adding G_GNUC_UNUSED