DDMsgReader: Inactivity disconnection more consistent with Synchronet...

DDMsgReader: Inactivity disconnection more consistent with Synchronet behavior. DDLightbarMenu: Use console.getkey() instead of getKeyWithESCChars(), as getKeyWithESCChars() is no longer needed.
For DDMsgReader, User timeout 'AreYouThere' message and disconnection are more consistent with Synchronet's behavior. However, if the scrollable reader or lightbar list interface is being used, the 'AreYouThere' text will be set to a blank string for the duration of this script's run due to how the text can interfere with the screen and scrolling. The 'AreYouThere' sound will still occur though, and the user will be disconnected if they don't respond.