(client) chore:支持unity的方式加载资源，调整文件名与定义的分布

Client/Assets/Scripts/Data/ItemDef.cs

@@ -0,0 +1,13 @@
+namespace Data
+{
+    public class ItemDef:Define
+    {
+        public ImageDef texture;
+        public AttributesDef attributes;
+    }
+
+    public class WeaponDef : ItemDef
+    {
+        
+    }
+}