💥 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/email/mu4e/config.el

@@ -10,7 +10,7 @@
 (add-to-list 'auto-mode-alist '("\\.\\(?:offlineimap\\|mbsync\\)rc\\'" . conf-mode))
 
 
-(def-package! mu4e
+(use-package! mu4e
   :commands mu4e mu4e-compose-new
   :init
   (provide 'html2text) ; disable obsolete package
@@ -110,14 +110,14 @@
     'normal))
 
 
-(def-package! mu4e-maildirs-extension
+(use-package! mu4e-maildirs-extension
   :after mu4e
   :config
   (mu4e-maildirs-extension)
   (setq mu4e-maildirs-extension-title nil))
 
 
-(def-package! org-mu4e
+(use-package! org-mu4e
   :hook (mu4e-compose-mode . org-mu4e-compose-org-mode)
   :config
   (setq org-mu4e-link-query-in-headers-mode nil

modules/email/notmuch/config.el

@@ -51,17 +51,17 @@
     #'hide-mode-line-mode))
 
 
-(def-package! org-mime
+(use-package! org-mime
   :after (org notmuch)
   :config (setq org-mime-library 'mml))
 
 
-(def-package! counsel-notmuch
+(use-package! counsel-notmuch
   :when (featurep! :completion ivy)
   :commands counsel-notmuch
   :after notmuch)
 
-(def-package! helm-notmuch
+(use-package! helm-notmuch
   :when (featurep! :completion helm)
   :commands helm-notmuch
   :after notmuch)

modules/email/wanderlust/config.el

@@ -1,6 +1,6 @@
 ;;; app/wanderlust/config.el -*- lexical-binding: t; -*-
 
-(def-package! wl
+(use-package! wl
   :defer t
   :config
   (setq mail-user-agent 'wl-user-agent