Major refactor of Doom core files

- Remove core-os and move many of its settings out to other core
  libraries, where they belong
- Significantly improve commenting & compartmentalization of many
  settings
- Correct some mis-named public hooks (that were named as if they were
  private)
- Move the vast majority of optimizations to "Optimizations" section in
  core.el
- Don't activate xclip-mode or osx-clipboard-mode if we're accessing
  Emacs through an SSH connection (does more bad than good there)
- Add fast-but-imprecise-scrolling = t
- Set bidi-display-reordering = 'left-to-right, at the recommendation of
  an Emacs dev. Apparently setting it to nil is undefined, as Emacs is
  designed to always assume it's set; setting it explicitly to
  left-to-right will still do what was originally intended by turning it
  off: to reduce line/text scans for bidirectional text, which gives us
  a moderate boost in general runtime snappiness
- Set inhibit-compacting-fon-caches = t on windows (where it struggles
  especially with icon fonts)
- Disables "literal" mode for very large files (because I will be
  backporting so-long.el from Emacs 27 in the next commit)

modules/editor/evil/config.el

@@ -49,6 +49,12 @@ directives. By default, this only recognizes C directives.")
 
   (put 'evil-define-key* 'lisp-indent-function 'defun)
 
+  ;; stop copying each visual state move to the clipboard:
+  ;; https://bitbucket.org/lyro/evil/issue/336/osx-visual-state-copies-the-region-on
+  ;; grokked from:
+  ;; http://stackoverflow.com/questions/15873346/elisp-rename-macro
+  (advice-add #'evil-visual-update-x-selection :override #'ignore)
+
   ;; Start help-with-tutorial in emacs state
   (advice-add #'help-with-tutorial :after (lambda (&rest _) (evil-emacs-state +1)))