Add Ref Compare List

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Use Ref Compare List in Sync Dialog

If current branch is not updated after pull, switch to Ref Compare tab

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Add "Hide unchanged refs in Ref Compare List" setting

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

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