* src/video_output/video_output.c: add a key-pressed variable to p_vout

 * modules/access/dvdplay/intf.c: allow keyboard naviagation in dvd-menus,
by reading the key-pressed variable
 * modules/control/lirc/lirc.c: allow navigation with remote control by
faking keypresses (closes #38). I think the remotes for dvdplayers usually
have buttons for "root menu" and "title menu". Whould this be easily
implemented in vlc?