Add a function to retrieve window list and share it where necessary.

Add a function to retrieve window list and share it where necessary.

2005-09-23  Marco Pesenti Gritti  <mpg@redhat.com>

        * shell/ev-application.c: (removed_from_session), (save_session),
        (init_session), (ev_application_get_empty_window),
        (ev_application_init), (ev_application_get_windows):
        * shell/ev-application.h:
        * shell/ev-window.c: (ev_window_finalize):

        Add a function to retrieve window list and share it where
        necessary.
        Implement session handling, works pretty well thanks to the
        metadata system.