* lisp/mouse.el: Rework the mouse-1-click remapping

* lisp/mouse.el: Rework the mouse-1-click remapping

Avoid peeking ahead at the next event because this had undesirable effects,
such as making 'this-single-command-raw-keys' return bogus information.

(mouse--last-down): New variable.
(mouse--down-1-maybe-follows-link): Don't do the remapping here.
Instead, just keep track of the time when the down happened.
(mouse--down-1-maybe-follows-link): Do the remapping here.
(key-translation-map): Add bindings for (double-)mouse-1.