tools/eval: associate plist with repl handlers

Also consolidates all REPLs (opened through the :tools eval module)
under one popup rule, which inhibits ESC from prematurely closing
them (#1944), and cleans up after their buffers *only* if their handlers
weren't specified to :persist, e.g.

  (set-repl-handler! 'some-mode #'some-repl-handler :persist t)

Also standardized ESS's REPL commands.

modules/lang/racket/config.el

@@ -10,7 +10,6 @@
 (use-package! racket-mode
   :hook (racket-repl-mode . racket-unicode-input-method-enable)
   :config
-  (set-popup-rule! "^\\*Racket REPL" :size 10 :select t)
   (set-repl-handler! 'racket-mode #'+racket/open-repl)
   (set-lookup-handlers! 'racket-mode
     :definition    #'racket-visit-definition