Git: Indicate affected commits for range operations

* Reset: Strikethrough discarded commits
* Interactive Rebase: Mark included commits
* Push to Gerrit: Mark pushed commits

Change-Id: I5599a72055fd94b88c55b74b3a1116c07e35c113
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>