Fix recovery middleware to render gitea style page. (#13857)

* Some changes to fix recovery

* Move Recovery to middlewares

* Remove trace code

* Fix lint

* add session middleware and remove dependent on macaron for sso

* Fix panic 500 page rendering

* Fix bugs

* Fix fmt

* Fix vendor

* recover unnecessary change

* Fix lint and addd some comments about the copied codes.

* Use util.StatDir instead of com.StatDir

Co-authored-by: 6543 <6543@obermui.de>

vendor/github.com/couchbase/gomemcached/mc_res.go

@@ -38,7 +38,7 @@ func (res *MCResponse) Error() string {
 }
 
 func errStatus(e error) Status {
-	status := Status(0xffff)
+	status := UNKNOWN_STATUS
 	if res, ok := e.(*MCResponse); ok {
 		status = res.Status
 	}