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)

core/core-keybinds.el

@@ -73,10 +73,11 @@ If any hook returns non-nil, all hooks after it are ignored.")
 ;;
 ;;; General + leader/localleader keys
 
-(require 'general)
-;; Convenience aliases
-(defalias 'define-key! #'general-def)
-(defalias 'unmap! #'general-unbind)
+(use-package general
+  :config
+  ;; Convenience aliases
+  (defalias 'define-key! #'general-def)
+  (defalias 'unmap! #'general-unbind))
 
 ;; `map!' uses this instead of `define-leader-key!' because it consumes 20-30%
 ;; more startup time, so we reimplement it ourselves.
@@ -216,7 +217,7 @@ localleader prefix."
     (?g . global))
   "A list of cons cells that map a letter to a evil state symbol.")
 
-(defun doom--keyword-to-states (keyword)
+(defun doom--map-keyword-to-states (keyword)
   "Convert a KEYWORD into a list of evil state symbols.
 
 For example, :nvi will map to (list 'normal 'visual 'insert). See
@@ -307,7 +308,9 @@ For example, :nvi will map to (list 'normal 'visual 'insert). See
                           doom--map-forms)))
                  (_
                   (condition-case _
-                      (doom--map-def (pop rest) (pop rest) (doom--keyword-to-states key) desc)
+                      (doom--map-def (pop rest) (pop rest)
+                                     (doom--map-keyword-to-states key)
+                                     desc)
                     (error
                      (error "Not a valid `map!' property: %s" key)))
                   (setq desc nil))))