migrate from com.* to alternatives (#14103)

* remove github.com/unknwon/com from models

* dont use "com.ToStr()"

* replace "com.ToStr" with "fmt.Sprint" where its easy to do

* more refactor

* fix test

* just "proxy" Copy func for now

* as per @lunny

services/mirror/mirror.go

@@ -8,6 +8,7 @@ import (
 	"context"
 	"fmt"
 	"net/url"
+	"strconv"
 	"strings"
 	"time"
 
@@ -22,8 +23,6 @@ import (
 	"code.gitea.io/gitea/modules/sync"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/util"
-
-	"github.com/unknwon/com"
 )
 
 // mirrorQueue holds an UniqueQueue object of the mirror
@@ -396,11 +395,11 @@ func syncMirror(repoID string) {
 	}()
 	mirrorQueue.Remove(repoID)
 
-	m, err := models.GetMirrorByRepoID(com.StrTo(repoID).MustInt64())
+	id, _ := strconv.ParseInt(repoID, 10, 64)
+	m, err := models.GetMirrorByRepoID(id)
 	if err != nil {
 		log.Error("GetMirrorByRepoID [%s]: %v", repoID, err)
 		return
-
 	}
 
 	log.Trace("SyncMirrors [repo: %-v]: Running Sync", m.Repo)