💥 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/scala/config.el

@@ -14,7 +14,7 @@
     (add-hook 'scala-mode-local-vars-hook #'lsp!)))
 
 
-(def-package! ensime
+(use-package! ensime
   :unless (featurep! +lsp)
   :defer t
   :config
@@ -31,6 +31,6 @@
   (require 'imenu))
 
 
-(def-package! sbt-mode
+(use-package! sbt-mode
   :after scala-mode
   :config (set-repl-handler! 'scala-mode #'+scala/open-repl))