Standardize REPL commands & improve SPC o r

- SPC o r now prompts for a REPL to open when none was found for the
  current buffer.
- REPL handlers must now follow the naming convention "*/open*-repl".
  e.g. +python/open-ipython-repl, +emacs-lisp/open-repl, etc.
- +eval/open-repl has been split in two:
  - +eval/open-repl-other-window
  - +eval/open-repl-same-window

modules/lang/sh/autoload.el

@@ -27,7 +27,7 @@
 
 (defvar sh-shell-file)
 ;;;###autoload
-(defun +sh/repl ()
+(defun +sh/open-repl ()
   "Open a shell REPL."
   (let* ((dest-sh (symbol-name sh-shell))
          (sh-shell-file dest-sh))