lang/org: major refactor & add org-fancy-priorities package

- Fixes an issue where evil bindings weren't working in org-mode
- Significantly slims down on unnecessary keybinds
- Remove +org-init-keybinds-for-evil-h hook and reli more on our new
  evil-org fork, which has upstreamed some of our changes.
- Documents undocumented functions, remove unnused ones, and reorganize
  org's autoload libraries by convention.
- Adds org-fancy-priorities for more elegant (and subtle) priority
  display than ugly [#A] tags.

modules/lang/org/autoload/contrib-dragndrop.el

@@ -3,7 +3,7 @@
 
 ;;;###autoload
 (defun +org-dragndrop-download-dnd-fn (uri action)
-  "TODO"
+  "Handle file links and base64 data uris."
   (if (eq major-mode 'org-mode)
       (+org-attach/uri uri)
     (let ((dnd-protocol-alist