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在线用户和影子选手用图片显示，缩放等功能按钮微调

Assets/Scenes/Ride/Scripts/Singleton.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Assets.Scenes.Ride.Scripts
+{
+    public abstract class Singleton<T> where T : class, new()
+    {
+        private static T instance = null;
+
+        private static readonly object locker = new object();
+
+        public static T Instance
+        {
+            get
+            {
+                lock (locker)
+                {
+                    if (instance == null)
+                        instance = new T();
+                    return instance;
+                }
+            }
+        }
+    }
+}