The VectorBeforeFooter was marked as deprecated in 1.35. It should be removed in 1.36 (replaced with a more generic hook in core if needed).
There is one usage in ShoutAds so am interested in hearing from the maintainer about the use case.
I'm pretty sure that SkinAfterContent with some CSS or AddFooterLink could be used to achieve the same effect. Please let me know :)
- Remove VectorFooter from the codebase (no need to add release notes as there is no process in place for skins)