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.