Fix :after-call deferred packages not loading

If you open emacs with a file (emacs file.txt), the file is switched to
before the switch-buffer hooks are set up. However, many core packages
are hooked to those switch-buffer hooks (to load when they're first
triggered). They miss the boat and don't get loaded.

These packages are now hooked onto after-find-file as well (and
immediately), which will fire when a file is opened, before or after
initialization.

Fixes #680

core/core-editor.el

@@ -79,7 +79,7 @@ fundamental-mode) for performance sake."
 
 ;; revert buffers for changed files
 (def-package! autorevert
-  :after-call doom-before-switch-buffer-hook
+  :after-call after-find-file
   :config
   (setq auto-revert-verbose nil)
   (global-auto-revert-mode +1))
@@ -97,7 +97,7 @@ fundamental-mode) for performance sake."
 
 ;; persistent point location in buffers
 (def-package! saveplace
-  :after-call doom-before-switch-buffer-hook
+  :after-call (after-find-file dired-initial-position-hook)
   :config
   (setq save-place-file (concat doom-cache-dir "saveplace"))
   (defun doom*recenter-on-load-saveplace (&rest _)
@@ -110,7 +110,7 @@ fundamental-mode) for performance sake."
 ;; Keep track of recently opened files
 (def-package! recentf
   :defer 1
-  :after-call find-file-hook
+  :after-call after-find-file
   :commands recentf-open-files
   :config
   (setq recentf-save-file (concat doom-cache-dir "recentf")
@@ -133,7 +133,7 @@ fundamental-mode) for performance sake."
 
 ;; Auto-close delimiters and blocks as you type
 (def-package! smartparens
-  :after-call doom-before-switch-buffer-hook
+  :after-call (doom-before-switch-buffer-hook after-find-file)
   :commands (sp-pair sp-local-pair sp-with-modes)
   :config
   (require 'smartparens-config)
@@ -153,7 +153,7 @@ fundamental-mode) for performance sake."
 
 ;; Branching undo
 (def-package! undo-tree
-  :after-call doom-before-switch-buffer-hook
+  :after-call (doom-before-switch-buffer-hook after-find-file)
   :config
   ;; persistent undo history is known to cause undo history corruption, which
   ;; can be very destructive! So disable it!

core/core-ui.el

@@ -308,7 +308,7 @@ DEFAULT is non-nil, set the default mode-line for all buffers."
 
 ;; highlight matching delimiters
 (def-package! paren
-  :after-call doom-before-switch-buffer-hook
+  :after-call post-command-hook
   :config
   (setq show-paren-delay 0.1
         show-paren-highlight-openparen t

modules/tools/editorconfig/config.el

@@ -4,7 +4,7 @@
 ;; specify their own formatting rules.
 (def-package! editorconfig
   :defer 2
-  :after-call doom-before-switch-buffer
+  :after-call (doom-before-switch-buffer after-find-file)
   :config
   ;; Register missing indent variables
   (setq editorconfig-indentation-alist