I change `user-emacs-directory' because most (if not all) packages --
even built-in ones -- abuse it exclusively to build paths for
storage/cache files (instead of correctly using
`locate-user-emacs-file'). This ensures your $EMACSDIR isn't littered
with data files *and* saves us the trouble of setting every
directory/file variable under the sun.
Granted, this introduces an edge case for any legitimate uses of the
variable (e.g. where the caller seeks to locate the user's initfiles),
but I've found no such uses in any of the packages I've audited for Doom
or elsewhere.
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