GitLab

* Move last commit cache back into modules/git
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Remove go-git from the interface for last commit cache
Signed-off-by: Andrew Thornton <art27@cantab.net>

* move cacheref to last_commit_cache
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Remove go-git from routers/private/hook
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Move FindLFSFiles to pipeline
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Make no-go-git variants
Signed-off-by: Andrew Thornton <art27@cantab.net>

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

* fix issue with GetCommitsInfo
Signed-off-by: Andrew Thornton <art27@cantab.net>

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

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

* More efficiency

Signed-off-by: Andrew...