Sanitation fix from Gogs (#1461)

* Santiation fix from Gogs

* Linting

* Fix build-errors

* still not working

* Fix all the things!

* gofmt

* Add code-injection checks

routers/init.go

@@ -49,7 +49,7 @@ func GlobalInit() {
 
 	if setting.InstallLock {
 		highlight.NewContext()
-		markdown.BuildSanitizer()
+		markdown.NewSanitizer()
 		if err := models.NewEngine(); err != nil {
 			log.Fatal(4, "Failed to initialize ORM engine: %v", err)
 		}