Move macaron to chi (#14293)

Use [chi](https://github.com/go-chi/chi) instead of the forked [macaron](https://gitea.com/macaron/macaron). Since macaron and chi have conflicts with session share, this big PR becomes a have-to thing. According my previous idea, we can replace macaron step by step but I'm wrong. :( Below is a list of big changes on this PR.

- [x] Define `context.ResponseWriter` interface with an implementation `context.Response`.
- [x] Use chi instead of macaron, and also a customize `Route` to wrap chi so that the router usage is similar as before.
- [x] Create different routers for `web`, `api`, `internal` and `install` so that the codes will be more clear and no magic .
- [x] Use https://github.com/unrolled/render instead of macaron's internal render
- [x] Use https://github.com/NYTimes/gziphandler instead of https://gitea.com/macaron/gzip
- [x] Use https://gitea.com/go-chi/session which is a modified version of https://gitea.com/macaron/session and removed `nodb` support since it will not be maintained. **BREAK**
- [x] Use https://gitea.com/go-chi/captcha which is a modified version of https://gitea.com/macaron/captcha
- [x] Use https://gitea.com/go-chi/cache which is a modified version of https://gitea.com/macaron/cache
- [x] Use https://gitea.com/go-chi/binding which is a modified version of https://gitea.com/macaron/binding
- [x] Use https://github.com/go-chi/cors instead of https://gitea.com/macaron/cors
- [x] Dropped https://gitea.com/macaron/i18n and make a new one in `code.gitea.io/gitea/modules/translation`
- [x] Move validation form structs from `code.gitea.io/gitea/modules/auth` to `code.gitea.io/gitea/modules/forms` to avoid dependency cycle.
- [x] Removed macaron log service because it's not need any more. **BREAK**
- [x] All form structs have to be get by `web.GetForm(ctx)` in the route function but not as a function parameter on routes definition.
- [x] Move Git HTTP protocol implementation to use routers directly.
- [x] Fix the problem that chi routes don't support trailing slash but macaron did.
- [x] `/api/v1/swagger` now will be redirect to `/api/swagger` but not render directly so that `APIContext` will not create a html render. 

Notices:
- Chi router don't support request with trailing slash
- Integration test `TestUserHeatmap` maybe mysql version related. It's failed on my macOS(mysql 5.7.29 installed via brew) but succeed on CI.

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

modules/templates/static.go

@@ -7,10 +7,7 @@
 package templates
 
 import (
-	"bytes"
-	"fmt"
 	"html/template"
-	"io"
 	"io/ioutil"
 	"os"
 	"path"
@@ -21,8 +18,6 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/util"
-
-	"gitea.com/macaron/macaron"
 )
 
 var (
@@ -30,24 +25,6 @@ var (
 	bodyTemplates    = template.New("")
 )
 
-type templateFileSystem struct {
-	files []macaron.TemplateFile
-}
-
-func (templates templateFileSystem) ListFiles() []macaron.TemplateFile {
-	return templates.files
-}
-
-func (templates templateFileSystem) Get(name string) (io.Reader, error) {
-	for i := range templates.files {
-		if templates.files[i].Name()+templates.files[i].Ext() == name {
-			return bytes.NewReader(templates.files[i].Data()), nil
-		}
-	}
-
-	return nil, fmt.Errorf("file '%s' not found", name)
-}
-
 // GetAsset get a special asset, only for chi
 func GetAsset(name string) ([]byte, error) {
 	bs, err := ioutil.ReadFile(filepath.Join(setting.CustomPath, name))
@@ -72,95 +49,6 @@ func GetAssetNames() []string {
 	return append(tmpls, customTmpls...)
 }
 
-func NewTemplateFileSystem() templateFileSystem {
-	fs := templateFileSystem{}
-	fs.files = make([]macaron.TemplateFile, 0, 10)
-
-	for _, assetPath := range AssetNames() {
-		if strings.HasPrefix(assetPath, "mail/") {
-			continue
-		}
-
-		if !strings.HasSuffix(assetPath, ".tmpl") {
-			continue
-		}
-
-		content, err := Asset(assetPath)
-
-		if err != nil {
-			log.Warn("Failed to read embedded %s template. %v", assetPath, err)
-			continue
-		}
-
-		fs.files = append(fs.files, macaron.NewTplFile(
-			strings.TrimSuffix(
-				assetPath,
-				".tmpl",
-			),
-			content,
-			".tmpl",
-		))
-	}
-
-	customDir := path.Join(setting.CustomPath, "templates")
-	isDir, err := util.IsDir(customDir)
-	if err != nil {
-		log.Warn("Unable to check if templates dir %s is a directory. Error: %v", customDir, err)
-	}
-	if isDir {
-		files, err := util.StatDir(customDir)
-
-		if err != nil {
-			log.Warn("Failed to read %s templates dir. %v", customDir, err)
-		} else {
-			for _, filePath := range files {
-				if strings.HasPrefix(filePath, "mail/") {
-					continue
-				}
-
-				if !strings.HasSuffix(filePath, ".tmpl") {
-					continue
-				}
-
-				content, err := ioutil.ReadFile(path.Join(customDir, filePath))
-
-				if err != nil {
-					log.Warn("Failed to read custom %s template. %v", filePath, err)
-					continue
-				}
-
-				fs.files = append(fs.files, macaron.NewTplFile(
-					strings.TrimSuffix(
-						filePath,
-						".tmpl",
-					),
-					content,
-					".tmpl",
-				))
-			}
-		}
-	}
-
-	return fs
-}
-
-// HTMLRenderer implements the macaron handler for serving HTML templates.
-func HTMLRenderer() macaron.Handler {
-	return macaron.Renderer(macaron.RenderOptions{
-		Funcs:              NewFuncMap(),
-		TemplateFileSystem: NewTemplateFileSystem(),
-	})
-}
-
-// JSONRenderer implements the macaron handler for serving JSON templates.
-func JSONRenderer() macaron.Handler {
-	return macaron.Renderer(macaron.RenderOptions{
-		Funcs:              NewFuncMap(),
-		TemplateFileSystem: NewTemplateFileSystem(),
-		HTMLContentType:    "application/json",
-	})
-}
-
 // Mailer provides the templates required for sending notification mails.
 func Mailer() (*texttmpl.Template, *template.Template) {
 	for _, funcs := range NewTextFuncMap() {