feat: add zibi and unset zibi command, bump rob to 1.8.4

src/main/kotlin/cn/rtast/fancybot/commands/EchoCommand.kt

@@ -9,12 +9,12 @@ package cn.rtast.fancybot.commands
 
 import cn.rtast.rob.entity.GroupMessage
 import cn.rtast.rob.util.BaseCommand
-import cn.rtast.rob.util.ob.OBMessage
+import cn.rtast.rob.util.ob.OneBotListener
 
 class EchoCommand : BaseCommand() {
     override val commandNames = listOf("/echo")
 
-    override suspend fun executeGroup(listener: OBMessage, message: GroupMessage, args: List<String>) {
+    override suspend fun executeGroup(listener: OneBotListener, message: GroupMessage, args: List<String>) {
         listener.sendGroupMessage(message.groupId, args.joinToString(" "))
     }
 }