Refactor core initialization process

A vastly simpler bootstrap process.

Also load core libs in core-lib (duh)

core/core-lib.el

@@ -1,5 +1,10 @@
 ;;; core-lib.el -*- lexical-binding: t; -*-
 
+(let ((load-path doom-site-load-path))
+  (require 'subr-x)
+  (require 'cl-lib)
+  (require 'map))
+
 (eval-and-compile
   (unless EMACS26+
     (with-no-warnings