General refactor + cleanup; update TODO.org

core/core-ui.el

@@ -224,7 +224,7 @@ file."
 ;; For a distractions-free-like UI, that dynamically resizes margets and can
 ;; center a buffer.
 (def-package! visual-fill-column
-  :commands (visual-fill-column-mode)
+  :commands visual-fill-column-mode
   :config
   (setq-default visual-fill-column-center-text nil
                 visual-fill-column-width fill-column))

core/core.el

@@ -95,6 +95,7 @@ there are problems.")
  create-lockfiles nil
  history-length 1000
  make-backup-files nil
+ undo-tree-auto-save-history t
  ;; files
  abbrev-file-name             (concat doom-local-dir "abbrev.el")
  auto-save-list-file-name     (concat doom-cache-dir "autosave")