Use the new keyword ':repeat' in repeatable keymaps.

Use the new keyword ':repeat' in repeatable keymaps.

* lisp/bindings.el (undo-repeat-map)
(buffer-navigation-repeat-map, next-error-repeat-map)
(page-navigation-repeat-map):
* lisp/comint.el (comint-repeat-map):
* lisp/dired.el (dired-jump-map):
* lisp/outline.el (outline-navigation-repeat-map)
(outline-editing-repeat-map):
* lisp/shell.el (shell-repeat-map):
* lisp/tab-bar.el (tab-bar-switch-repeat-map)
(tab-bar-move-repeat-map):
* lisp/window.el (other-window-repeat-map)
(resize-window-repeat-map):
* lisp/winner.el (winner-repeat-map):
* lisp/eshell/em-prompt.el (eshell-prompt-repeat-map):
* lisp/eshell/esh-mode.el (eshell-command-repeat-map):
Add the keyword ':repeat' to 'defvar-keymap' instead of
setting the symbol property 'repeat-map' explicitly.

* lisp/keymap.el (defvar-keymap): Check for 'props'
that is used in 'defvar-form'.