💥 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/lang/plantuml/config.el

@@ -1,6 +1,6 @@
 ;;; lang/plantuml/config.el -*- lexical-binding: t; -*-
 
-(def-package! plantuml-mode
+(use-package! plantuml-mode
   :defer t
   :init
   (setq plantuml-jar-path (concat doom-etc-dir "plantuml.jar")
@@ -9,7 +9,7 @@
   (set-popup-rule! "^\\*PLANTUML" :size 0.4 :select nil :ttl 0))
 
 
-(def-package! flycheck-plantuml
+(use-package! flycheck-plantuml
   :when (featurep! :tools flycheck)
   :after plantuml-mode
   :config (flycheck-plantuml-setup))