Use vfsgen instead of go-bindata (#7080)

* use vfsgen instead of go-bindata

* fix templates

* fix fmt

* vendor vsfgen

modules/templates/static.go

@@ -203,3 +203,21 @@ func Mailer() *template.Template {
 
 	return templates
 }
+
+func Asset(name string) ([]byte, error) {
+	f, err := Assets.Open("/" + name)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	return ioutil.ReadAll(f)
+}
+
+func AssetNames() []string {
+	realFS := Assets.(vfsgen۰FS)
+	var results = make([]string, 0, len(realFS))
+	for k := range realFS {
+		results = append(results, k[1:])
+	}
+	return results
+}