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/tools/ein/config.el

@@ -16,18 +16,19 @@
         ;; Slice images into rows; easier to navigate around images
         ein:slice-image t)
 
-  (set! :popup "\\*ein: .*" :ignore)
-  (set! :popup "\\*ein:tb .*"
-    '((side . bottom) (size . 0.3))
-    '((quit . t) (transient) (select)))
-  (set! :popup "\\*ein:notebooklist *"
-    '((side . left) (size . 50))
-    '((select)))
+  (set-popup-rules!
+   '(("\\*ein: .*" :ignore t)
+     ("\\*ein:tb .*"
+      ((side . bottom) (size . 0.3))
+      ((quit . t) (transient) (select)))
+     ("\\*ein:notebooklist *"
+      ((side . left) (size . 50))
+      ((select)))))
 
   (when (featurep! :completion company)
     ;; Code completion with company
     (setq ein:completion-backend 'ein:use-company-backend)
-    (set! :company-backend '(ein:notebook-multilang-mode
+    (set-company-backend! '(ein:notebook-multilang-mode
                              ein:notebook-python-mode
                              ein:notebook-plain-mode)
       'ein:company-backend))

modules/tools/gist/config.el

@@ -5,7 +5,7 @@
 ;; Emacs.
 
 (after! gist
-  (set! :evil-state 'gist-list-mode 'normal)
+  (set-evil-initial-state! 'gist-list-mode 'normal)
 
   (defun +gist*list-render (orig-fn &rest args)
     (funcall orig-fn (car args) t)

modules/tools/magit/config.el

@@ -25,7 +25,7 @@ load everything.")
         magit-diff-refine-hunk t ;; Show word-granularity on the currently selected hunk
         magit-display-buffer-function #'+magit-display-buffer-fullscreen)
 
-  (set! :popup "^\\(?:\\*magit\\|magit:\\)" :ignore)
+  (set-popup-rule! "^\\(?:\\*magit\\|magit:\\)" :ignore)
   ;; Consider magit buffers real (so they can switched to)
   (add-hook 'magit-mode-hook #'doom|mark-buffer-as-real)
   ;; no mode-line in magit popups

modules/tools/password-store/config.el

@@ -27,8 +27,8 @@
 ;; `pass'
 (after! pass
   (set! :env "PASSWORD_STORE_DIR")
-  (set! :evil-state 'pass-mode 'emacs)
-  (set! :popup "^\\*Password-Store"
+  (set-evil-initial-state! 'pass-mode 'emacs)
+  (set-popup-rule! "^\\*Password-Store"
     '((side . left) (size . 0.25))
     '((quit)))
   (define-key! pass-mode-map

modules/tools/pdf/config.el

@@ -18,9 +18,9 @@
     (load! "+modeline")
     (add-hook! 'pdf-tools-enabled-hook (doom-set-modeline 'pdf-tools-modeline)))
   ;; Handle PDF-tools related popups better
-  (set! :popup "^\\*Outline*" '((side . right) (size . 40)) '((select)))
+  (set-popup-rule! "^\\*Outline*" '((side . right) (size . 40)) '((select)))
   ;; TODO: Add additional important windows that should be handled differently
   ;; TODO: These two next rules don't work (they should), investigate
-  ;; (set! :popup "\\*Contents\\*" '((side . right) (size . 40)) nil)
-  ;; (set! :popup "* annots\\*$" '((side . left) (size . 40)) '((select)))
+  ;; (set-popup-rule! "\\*Contents\\*" '((side . right) (size . 40)) nil)
+  ;; (set-popup-rule! "* annots\\*$" '((side . left) (size . 40)) '((select)))
   )

modules/tools/prodigy/config.el

@@ -1,7 +1,7 @@
 ;;; tools/prodigy/config.el -*- lexical-binding: t; -*-
 
 (after! prodigy
-  (set! :evil-state 'prodigy-mode 'emacs)
+  (set-evil-initial-state! 'prodigy-mode 'emacs)
 
   ;; Make services, etc persistent between Emacs sessions
   (doom-cache-persist