💥 Rename def-package! -> use-package!

Calling this pivotal macro "def-package!" has frequently been a source
of confusion. It is a thin wrapper around use-package, and it should be
obvious that it is so. For this reason, and to match the naming
convention used with other convenience macros/wrappers, it is now
use-package!.

Also changes def-package-hook! -> use-package-hook!

The old macros are now marked obsolete and will be removed when straight
integration is merged.

modules/term/eshell/config.el

@@ -152,15 +152,15 @@ You should use `set-eshell-alias!' to change this.")
             [remap evil-window-vsplit]  #'+eshell/split-right))))
 
 
-(def-package! eshell-up
+(use-package! eshell-up
   :commands eshell-up eshell-up-peek)
 
 
-(def-package! shrink-path
+(use-package! shrink-path
   :commands shrink-path-file)
 
 
-(def-package! eshell-z
+(use-package! eshell-z
   :after eshell
   :config
   ;; Use zsh's db if it exists, otherwise, store it in `doom-cache-dir'

modules/term/vterm/config.el

@@ -1,6 +1,6 @@
 ;;; term/vterm/config.el -*- lexical-binding: t; -*-
 
-(def-package! vterm
+(use-package! vterm
   :when (fboundp 'module-load)
   :defer t
   :preface (setq vterm-install t)