Drop unused code

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Fixed issue #2323: TortoiseGit does not pull --tags despite checking Tags

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
No need to check for nullptr on free

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Implement git describe in Log Dialog

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>