* created a variable "key-pressed" in p_vlc that can be used to
   report or read key presses
 * allways try to start hotkeys interface in the background
configure.ac, modules/control/Modules.am, modules/control/hotkeys.c:
 * a new control module that reads keypresses from "key-pressed" and
   performs an action depending on what is asosiated with this key.
   Also uses nice on screen messages to indicate what action was performed
modules/video_filter/filter_common.h:
 * removed code to pass old style key reporting through filters
modules/video_output/x11/xcommon.c:
 * report key-presses through the new mechanism. Incomplete, I need help
   with this.