Refactor doom-initialize functions

Removes doom-module-table; which was inflexible (though more stable). It
prevented you from putting your doom! block in anywhere but
~/.doom.d/init.el.

It is replaced (somewhat) by (doom-modules).

core/core.el

@@ -120,7 +120,6 @@ else (except for `window-setup-hook').")
  tramp-persistency-file-name  (concat doom-cache-dir "tramp-persistency.el")
  url-cache-directory          (concat doom-cache-dir "url/")
  url-configuration-directory  (concat doom-etc-dir "url/"))
-(load custom-file t t t)
 
 
 ;;
@@ -201,11 +200,12 @@ this, you'll get stuttering and random freezes) and resets
 
 (require 'core-lib)
 (require 'core-packages)
+(when noninteractive
+  (require 'core-dispatcher))
 
+(load custom-file t t t)
 (doom-initialize noninteractive)
-(if noninteractive
-    (require 'core-dispatcher)
-  (doom-initialize-modules))
+(doom-initialize-modules)
 
 (provide 'core)
 ;;; core.el ends here