简化高级Model命名，去掉后缀

Extend改名，Adv正式回归

library/think/model/adv.php

@@ -11,13 +11,11 @@
 
 namespace think\model;
 
-use traits\think\model\extend;
+T('think/model/adv');
-use traits\think\model\query;
-
-T('think/model/extend');
 T('think/model/query');
 
-class ExtendModel extends \think\model
+class Adv extends \think\model
 {
-    use extend, query;
+    use traits\think\model\adv;
+    use traits\think\model\query;
 }

library/think/model/mongo.php

@@ -17,7 +17,7 @@ use think\Loader;
  * MongoModel模型类
  * 实现了ODM和ActiveRecords模式
  */
-class MongoModel extends \Think\Model
+class Mongo extends \Think\Model
 {
     // 主键类型
     const TYPE_OBJECT = 1;

library/think/model/relation.php

@@ -12,7 +12,7 @@
 namespace think\model;
 
 T('think/model/relation');
-class RelationModel extends \think\model
+class Relation extends \think\model
 {
     use \traits\think\model\relation;
 }

library/think/model/view.php

@@ -12,7 +12,7 @@
 namespace think\model;
 
 T('think/model/view');
-class ViewModel extends \think\model
+class View extends \think\model
 {
     use \traits\think\model\view;
 }

traits/think/model/adv.php

@@ -14,9 +14,8 @@ namespace traits\think\model;
 use think\Lang;
 use think\Loader;
 
-trait Extend
+trait Adv
 {
-
     protected $partition = [];
 
     /**