feat: 实现IP起始部分的设置，并弃用了isServer变量

scripts/autoload/GameManager.gd

@@ -1,3 +1,4 @@
 extends Node
 
 var data_origin: String = ""
+var ip_begin: String = "192.168."

scripts/autoload/MultiGame.gd

@@ -1,17 +1,14 @@
 extends Node
 
-var isServer: bool
 
-# 基于低级 ENet 多人游戏
+# 基于 ENet 多人游戏
 
 func create_server(player_num: int) -> void:
-	isServer = true
 	var peer = ENetMultiplayerPeer.new()
 	peer.create_server(8989, player_num)
 	multiplayer.multiplayer_peer = peer
 
 func create_client(ip: String) -> void:
-	isServer = false
 	var peer = ENetMultiplayerPeer.new()
 	peer.create_client(ip, 8989)
 	multiplayer.multiplayer_peer = peer