[Update] BotCommandProcess 更新帮助信息, 补充Javadoc, 调整命令名;

[Change] RandomIntervalSendTimer 将下一执行时间从分钟调整为具体时间;
[Change] MessageEvent toString方法调整为输出具体实现类名而不是"MessageEvent";

src/main/java/net/lamgc/cgj/bot/event/MessageEvent.java

@@ -56,7 +56,7 @@ public abstract class MessageEvent implements EventObject, MessageSender {
 
     @Override
     public String toString() {
-        return "MessageEvent{" +
+        return this.getClass().getSimpleName() + "{" +
                 "fromGroup=" + getFromGroup() +
                 ", fromQQ=" + getFromQQ() +
                 ", message='" + getMessage() + '\'' +