* lisp/tab-line.el: Bind mouse commands to [tab-line].

* lisp/tab-line.el: Bind mouse commands to [tab-line].

* lisp/tab-line.el: Bind mouse-4/mouse-5, wheel-up/wheel-down
globally to [tab-line].
(tab-line-tab-map): Remove local bindings of mouse-4/mouse-5.
(tab-line-new-tab, tab-line-switch-to-prev-tab)
(tab-line-switch-to-next-tab, tab-line-close-tab):
Turn commands into mouse-free (can be used without mouse).