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/unrolled/render/doc.go

@@ -0,0 +1,55 @@
+/*Package render is a package that provides functionality for easily rendering JSON, XML, binary data, and HTML templates.
+
+  package main
+
+  import (
+      "encoding/xml"
+      "net/http"
+
+      "github.com/unrolled/render"  // or "gopkg.in/unrolled/render.v1"
+  )
+
+  type ExampleXml struct {
+      XMLName xml.Name `xml:"example"`
+      One     string   `xml:"one,attr"`
+      Two     string   `xml:"two,attr"`
+  }
+
+  func main() {
+      r := render.New()
+      mux := http.NewServeMux()
+
+      mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
+          w.Write([]byte("Welcome, visit sub pages now."))
+      })
+
+      mux.HandleFunc("/data", func(w http.ResponseWriter, req *http.Request) {
+          r.Data(w, http.StatusOK, []byte("Some binary data here."))
+      })
+
+      mux.HandleFunc("/text", func(w http.ResponseWriter, req *http.Request) {
+          r.Text(w, http.StatusOK, "Plain text here")
+      })
+
+      mux.HandleFunc("/json", func(w http.ResponseWriter, req *http.Request) {
+          r.JSON(w, http.StatusOK, map[string]string{"hello": "json"})
+      })
+
+      mux.HandleFunc("/jsonp", func(w http.ResponseWriter, req *http.Request) {
+          r.JSONP(w, http.StatusOK, "callbackName", map[string]string{"hello": "jsonp"})
+      })
+
+      mux.HandleFunc("/xml", func(w http.ResponseWriter, req *http.Request) {
+          r.XML(w, http.StatusOK, ExampleXml{One: "hello", Two: "xml"})
+      })
+
+      mux.HandleFunc("/html", func(w http.ResponseWriter, req *http.Request) {
+          // Assumes you have a template in ./templates called "example.tmpl".
+          // $ mkdir -p templates && echo "<h1>Hello HTML world.</h1>" > templates/example.tmpl
+          r.HTML(w, http.StatusOK, "example", nil)
+      })
+
+      http.ListenAndServe("0.0.0.0:3000", mux)
+  }
+*/
+package render