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

modules/lang/php/config.el

@@ -96,10 +96,9 @@
 ;; Projects
 
 (def-project-mode! +php-laravel-mode
-  :modes (php-mode yaml-mode web-mode nxml-mode js2-mode scss-mode)
+  :modes '(php-mode yaml-mode web-mode nxml-mode js2-mode scss-mode)
   :files (and "artisan" "server.php"))
 
 (def-project-mode! +php-composer-mode
-  :modes (web-mode php-mode)
+  :modes '(web-mode php-mode)
   :files ("composer.json"))
-