Refactor DOOM init & add new init hooks

+ Add doom-init-hook and doom-post-init-hook to simplify Emacs init
  hooks into less ambiguous ones.
+ Attach former after-init-hook and emacs-startup-hook hooks to new doom
  init hooks.
+ Vastly improves daemon and tty support: preventing incorrect colors
  from bleeding across face class barriers, and into GUI Emacs and vice
  versa, when spawned with emacsclient.
+ Fix persp-mode breaking Emacs daemon, and ensuring that initialization
  is done properly in terminal Emacs (and emacsclient frames).

core/core-editor.el

@@ -107,7 +107,7 @@ fundamental-mode) for performance sake."
       savehist-autosave-interval nil ; save on kill only
       savehist-additional-variables '(kill-ring search-ring regexp-search-ring)
       save-place-file (concat doom-cache-dir "saveplace"))
-(add-hook! 'emacs-startup-hook #'(savehist-mode save-place-mode))
+(add-hook! 'doom-init-hook #'(savehist-mode save-place-mode))
 
 ;; Keep track of recently opened files
 (def-package! recentf
@@ -151,7 +151,7 @@ fundamental-mode) for performance sake."
               (t (error "%s is an invalid action for :editorconfig" action)))))
 
   :config
-  (add-hook 'emacs-startup-hook #'editorconfig-mode)
+  (add-hook 'doom-init-hook #'editorconfig-mode)
 
   (defun doom|editorconfig-whitespace-mode-maybe (&rest _)
     "Show whitespace-mode when file uses TABS (ew)."
@@ -169,7 +169,7 @@ fundamental-mode) for performance sake."
         sp-max-pair-length 3)
 
   :config
-  (add-hook 'emacs-startup-hook #'smartparens-global-mode)
+  (add-hook 'doom-init-hook #'smartparens-global-mode)
   (require 'smartparens-config)
   ;; Smartparens interferes with Replace mode
   (add-hook 'evil-replace-state-entry-hook #'turn-off-smartparens-mode)