add /usr/libexec/openbox-autostart which runs the global/user scripts and
launches /usr/libexec/openbox-xdg-autostart (which runs .desktop autostart
stuff)
make openbox-session call openbox with --startup option, to make openbox launch
/usr/libexec/openbox-autostart *after* it is initialized.
add /etc/xdg/openbox/environment and ~/.config/openbox/environment files to let
user change environment variables (locale) for their Openbox session, which
openbox-session loads before running openbox.
