Rewrote the filesystem handlers to use a far more elegant system

It is now far easier to build file system paths (no need to use the format
command anymore) as well as maintain readability (a huge factor in this
change). I have updated logic/shell.clp, etc/skel/bootstrap.clp, and
etc/sys.clp. The new filesystem handlers are methods of the form
/etc, /lib, /data, etc. These functions make it possible to build up paths
without sacrificing readability :D.