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/emacs/vc/config.el

@@ -1,6 +1,11 @@
 ;;; emacs/vc/config.el -*- lexical-binding: t; -*-
 
-(setq vc-make-backup-files nil)
+(when IS-WINDOWS
+  (setenv "GIT_ASKPASS" "git-gui--askpass"))
+
+
+(setq vc-make-backup-files nil
+      vc-follow-symlinks t)
 
 
 (after! git-timemachine