Change the order of context-menu-functions and add more context menus.

Change the order of context-menu-functions and add more context menus.

* lisp/mouse.el (context-menu-functions): Update default list.
(context-menu-overriding-function): Remove variable.
(context-menu-map): Reverse the order.
(context-menu-global, context-menu-local, context-menu-minor): New functions.
(context-menu-undo, context-menu-region): Add separators.
Use define-key-after instead of bindings--define-key.
(context-menu-entry): New variable.
(context-menu-mode): Use it.

* lisp/dired.el (dired-context-menu): New function.
(dired-mode): Add it to context-menu-functions.

* lisp/info.el (Info-context-menu): Reorder.

* lisp/net/goto-addr.el (goto-address-at-mouse):
Rename from goto-address-at-click.
(goto-address-context-menu): Use goto-address-at-mouse.

* lisp/progmodes/prog-mode.el (prog-context-menu): New function.
(prog-mode): Add it to context-menu-functions.