Drop unused code

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Refactor names related to Export Dialog

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Export Dialog: Add option to use commit time as archive modification time

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Merge branch 'export-commit-time'