fix: 修复聊天系统编译错误

- 修复 WebSocketManager/SocketIOClient 函数缩进错误
- 重命名 is_connected() 避免与 Object 基类冲突
- 修复 tscn 文件多余前导空格
- 修复测试文件 GUT 断言函数调用
- 添加 GUT 测试框架

addons/gut/parameter_handler.gd

@@ -0,0 +1,36 @@
+var _params = null
+var _call_count = 0
+var _logger = null
+
+func _init(params=null):
+	_params = params
+	_logger = GutUtils.get_logger()
+	if(typeof(_params) != TYPE_ARRAY):
+		_logger.error('You must pass an array to parameter_handler constructor.')
+		_params = null
+
+
+func next_parameters():
+	_call_count += 1
+	return _params[_call_count -1]
+
+func get_current_parameters():
+	return _params[_call_count]
+
+func is_done():
+	var done = true
+	if(_params != null):
+		done = _call_count == _params.size()
+	return done
+
+func get_logger():
+	return _logger
+
+func set_logger(logger):
+	_logger = logger
+
+func get_call_count():
+	return _call_count
+
+func get_parameter_count():
+	return _params.size()