Replace :eval/:repl with autodef functions

+ :eval => set-eval-handler!
+ :repl => set-repl-handler!
+ Updates all internal references.

modules/lang/crystal/config.el

@@ -6,7 +6,7 @@
   (set! :lookup 'crystal-mode
     :definition #'crystal-def-jump
     :references #'crystal-tool-imp)
-  (set! :eval 'crystal-mode
+  (set-eval-handler! 'crystal-mode
         '((:command     . "crystal")
           (:exec        . "%c %s")
           (:description . "Run Crystal script"))))