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

modules/base/tool.go

@@ -26,7 +26,6 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 
 	"github.com/dustin/go-humanize"
-	"github.com/unknwon/com"
 )
 
 // EncodeMD5 encodes string to md5 hex value.
@@ -86,8 +85,8 @@ func VerifyTimeLimitCode(data string, minutes int, code string) bool {
 	// split code
 	start := code[:12]
 	lives := code[12:18]
-	if d, err := com.StrTo(lives).Int(); err == nil {
-		minutes = d
+	if d, err := strconv.ParseInt(lives, 10, 0); err == nil {
+		minutes = int(d)
 	}
 
 	// right active code
@@ -131,7 +130,7 @@ func CreateTimeLimitCode(data string, minutes int, startInf interface{}) string
 
 	// create sha1 encode string
 	sh := sha1.New()
-	_, _ = sh.Write([]byte(data + setting.SecretKey + startStr + endStr + com.ToStr(minutes)))
+	_, _ = sh.Write([]byte(fmt.Sprintf("%s%s%s%s%d", data, setting.SecretKey, startStr, endStr, minutes)))
 	encoded := hex.EncodeToString(sh.Sum(nil))
 
 	code := fmt.Sprintf("%s%06d%s", startStr, minutes, encoded)
@@ -223,7 +222,7 @@ func TruncateString(str string, limit int) string {
 func StringsToInt64s(strs []string) ([]int64, error) {
 	ints := make([]int64, len(strs))
 	for i := range strs {
-		n, err := com.StrTo(strs[i]).Int64()
+		n, err := strconv.ParseInt(strs[i], 10, 64)
 		if err != nil {
 			return ints, err
 		}