v2.22.0
docs/*: update mode description for affected versions
*: update to v3_6_experimental spec
config/*: extend special bit validation logic to 3.4.0 and 3.5.0
*: bump import path
Fix comment formatting for gofmt 1.19
config/types/config: prevent files/links/dirs from conflicting with systemd units and dropins
config/*: move masking of special mode bits to < 3.6.0
*: fix gosimple warnings