This allows programs not specifically written for Redox OS to discover
information about the OS it is running on.

This keeps /etc/init.d for local overrides without risking them getting
overwritten by system updates.

This matches the behavior of most UNIX systems and ensures that the disk
doesn't eventually fills entirely with unused temporary files.

This matches the directory layout of modern Linux systems.

This ensures that the gid's for the auto-generated user groups stay in
sync with the gid in /etc/passwd. It also makes it easier to evolve the
format of /etc/group in the future.