wmDrawer is a dock application (dockapp) which provides a drawer (retractable
button bar) to launch applications.
   * The drawer is retractable and animated.
   * Several columns of buttons can be defined in the drawer.
   * The configuration file is automaticaly reloaded if it changes.
   * Multiple instances of the program can run at the same time.
   * Button's highlight under mouse cursor.
   * Drawer's transparency (need SHAPE extension).
   * Ability to launch several apps at once from the drawer. By holding down
     the key Shift or by using mouse buttons middle or right instead of left,
     you can keep the drawer opened.