Huge only because he seperated commits for each header. Just about 100k, less than a typical filesystem. No logic changed, he just removed unneeded deps, split

Huge only because he seperated commits for each header. Just about 100k, less than a typical filesystem. No logic changed, he just removed unneeded deps, split some headers into 2. Other patches are harder to review. But the crux is to test against all the configs, and the burden for external patches. This will require a major bump to 6.