* Add github api token option to generate-license & generate-gitignore

Without api toke, Will face rate limit sometimes.

Signed-off-by: a1012112796 <1012112796@qq.com>

* Use Basic authentication with tokens

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: a1012112796 <1012112796@qq.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

Replace all calls to os.Remove/os.RemoveAll by retrying util.Remove/util.RemoveAll and remove circular dependencies from util.

Fix #12339

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: silverwind <me@silverwind.io>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* update gitignore

* Handle symlink in tar

* Add some logs

* Renamed scripts directory into contrib

* Added script to download gitignores from github

* Synced gitignores with github repo