💥 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/lua/config.el

@@ -7,7 +7,7 @@
 ;;
 ;; Major modes
 
-(def-package! lua-mode
+(use-package! lua-mode
   :defer t
   :init
   ;; lua-indent-level defaults to 3 otherwise. Madness.
@@ -19,7 +19,7 @@
   (set-company-backend! 'lua-mode '(company-lua company-yasnippet)))
 
 
-(def-package! moonscript
+(use-package! moonscript
   :when (featurep! +moonscript)
   :defer t
   :config