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/tools/eval/config.el

@@ -8,6 +8,19 @@
 ;;
 ;; Packages
 
+(set-popup-rule!
+  (lambda (bufname _)
+    (when (boundp '+eval-repl-mode)
+      (buffer-local-value '+eval-repl-mode (get-buffer bufname))))
+  :ttl (lambda (buf)
+         (unless (plist-get +eval-repl-plist :persist)
+           (when-let (process (get-buffer-process buf))
+             (set-process-query-on-exit-flag process nil)
+             (kill-process process)
+             (kill-buffer buf))))
+  :size 0.25 :quit nil)
+
+
 (after! quickrun
   (setq quickrun-focus-p nil)