Add "alone time until stop" feature & config

src/main/java/com/jagrosh/jmusicbot/BotConfig.java

@@ -42,7 +42,7 @@ public class BotConfig
     private String token, prefix, altprefix, helpWord, playlistsFolder,
             successEmoji, warningEmoji, errorEmoji, loadingEmoji, searchingEmoji;
     private boolean stayInChannel, songInGame, npImages, updatealerts, useEval, dbots;
-    private long owner, maxSeconds;
+    private long owner, maxSeconds, aloneTimeUntilStop;
     private OnlineStatus status;
     private Activity game;
     private Config aliases;
@@ -94,6 +94,7 @@ public class BotConfig
             updatealerts = config.getBoolean("updatealerts");
             useEval = config.getBoolean("eval");
             maxSeconds = config.getLong("maxtime");
+            aloneTimeUntilStop = config.getLong("alonetimeuntilstop");
             playlistsFolder = config.getString("playlistsfolder");
             aliases = config.getConfig("aliases");
             dbots = owner == 113156185389092864L;
@@ -298,6 +299,11 @@ public class BotConfig
     {
         return FormatUtil.formatTime(maxSeconds * 1000);
     }
+
+    public long getAloneTimeUntilStop()
+    {
+        return aloneTimeUntilStop;
+    }
     
     public boolean isTooLong(AudioTrack track)
     {