Introduce autodefs to replace some settings

+ :popup -> set-popup-rule!
+ :popups -> set-popup-rules!
+ :company-backend -> set-company-backend!
+ :evil-state -> set-evil-initial-state!

I am slowly phasing out the setting system (def-setting! and set!),
starting with these.

What are autodefs? These are functions that are always defined, whether
or not their respective modules are enabled. However, when their modules
are disabled, they are replaced with macros that no-op and don't
waste time evaluating their arguments.

The old set! function will still work, for a while.

modules/lang/org/+babel.el

@@ -71,19 +71,19 @@ string). Stops at the first function to return non-nil.")
          (require 'ob-ipython nil t)))
   (add-hook '+org-babel-load-functions #'+org|babel-load-ipython)
   :config
-  (set! :popups
-    '("^\\*Org Src"
-      ((size . 100) (side . right) (slot . -1) (window-height . 0.6))
-      ((quit) (select . t) (modeline)))
-    '("^\\*Python"
-      ((slot . 0) (side . right) (size . 100))
-      ((select) (quit) (transient)))
-    '("\\*ob-ipython.*"
-      ((slot . 2) (side . right) (size . 100) (window-height . 0.2))
-      ((select) (quit) (transient)))
-    '("\\*Python:.*"
-      ((slot . 0) (side . right) (size . 100))
-      ((select) (quit) (transient))))
+  (set-popup-rules!
+    '(("^\\*Org Src"
+       ((size . 100) (side . right) (slot . -1) (window-height . 0.6))
+       ((quit) (select . t) (modeline)))
+      ("^\\*Python"
+       ((slot . 0) (side . right) (size . 100))
+       ((select) (quit) (transient)))
+      ("\\*ob-ipython.*"
+       ((slot . 2) (side . right) (size . 100) (window-height . 0.2))
+       ((select) (quit) (transient)))
+      ("\\*Python:.*"
+       ((slot . 0) (side . right) (size . 100))
+       ((select) (quit) (transient)))))
   ;; TODO Add more popup styles
 
   ;; advices for remote kernel and org-src-edit

modules/lang/org/config.el

@@ -137,19 +137,19 @@ unfold to point on startup."
 
 (defun +org|setup-popups-rules ()
   "Defines popup rules for org-mode (does nothing if :ui popup is disabled)."
-  (set! :popups
-    '("^\\*\\(?:Agenda Com\\|Calendar\\|Org \\(?:Links\\|Export Dispatcher\\|Select\\)\\)"
-      ((slot . -1) (vslot . -1) (size . +popup-shrink-to-fit))
-      ((transient . 0)))
-    '("^\\*Org Agenda"
-      ((size . 0.35))
-      ((select . t) (transient)))
-    '("^\\*Org Src"
-      ((size . 0.3))
-      ((quit) (select . t)))
-    '("^CAPTURE.*\\.org$"
-      ((size . 0.2))
-      ((quit) (select . t)))))
+  (set-popup-rules!
+    '(("^\\*\\(?:Agenda Com\\|Calendar\\|Org \\(?:Links\\|Export Dispatcher\\|Select\\)\\)"
+       ((slot . -1) (vslot . -1) (size . +popup-shrink-to-fit))
+       ((transient . 0)))
+      ("^\\*Org Agenda"
+       ((size . 0.35))
+       ((select . t) (transient)))
+      ("^\\*Org Src"
+       ((size . 0.3))
+       ((quit) (select . t)))
+      ("^CAPTURE.*\\.org$"
+       ((size . 0.2))
+       ((quit) (select . t))))))
 
 (defun +org|setup-ui ()
   "Configures the UI for `org-mode'."