💥 Replace core-popup with new feature/popup module

This is a breaking change! Update your :popup settings. Old ones will
throw errors!

Doom's new popup management system casts off its shackles (hur hur) and
replaces them with the monster that is `display-buffer-alist`, and
window parameters.

However, this is highly experimental! Expect edge cases.  Particularly
with org-mode and magit (or anything that does its own window
management).

Relevant to #261, #263, #325

modules/feature/evil/config.el

@@ -42,9 +42,8 @@
   (add-hook 'doom-init-hook #'evil-mode)
   (evil-select-search-module 'evil-search-module 'evil-search)
 
-  (set! :popup
-    '("*evil-registers*" :size 0.3)
-    '("*Command Line*" :size 8))
+  (set! :popup "^\\*evil-registers" '((size . 0.3)))
+  (set! :popup "^\\*Command Line" '((size . 8)))
 
   ;; Don't interfere with localleader key
   (define-key evil-motion-state-map "\\" nil)