player: add "pause" command, small fixes
player: add "pause" command, small fixes

- position cannot get negative, so use unsigned

- be sure that the read line is null-terminated (for strlen)

- clear buffers to avoid playing old data

DDVTECH/mistserver,rbouqueau/mistserver,DDVTECH/mistserver,DDVTECH/mistserver,rbouqueau/mistserver,DDVTECH/mistserver,rbouqueau/mistserver,rbouqueau/mistserver,DDVTECH/mistserver,rbouqueau/mistserver