core-lib: add auto-minor-mode, revise def-project-mode!

- Adds the auto-minor-mode package to replace our in-house
  implementation.
- Merges associate! into the def-project-mode! macro because associate!
  on its own is less useful than auto-minor-mode-alist,
  auto-minor-mode-magic-alist or hooks.
- Changes the semantics of :modes and :add-hooks properties of
  def-project-mode!. Its arguments are evaluated as is; lists will need
  to be quoted.

squash! core-lib: remove associate! macro

core/packages.el

@@ -3,6 +3,7 @@
 
 ;; core.el
 (package! dotenv-mode)
+(package! auto-minor-mode)
 
 ;; core-ui.el
 (package! all-the-icons)
@@ -44,6 +45,3 @@
 
 ;; autoload/debug.el
 (package! esup)
-
-;; cli/test.el
-(package! buttercup)