Add new live_exam_os

...tc/xdg/xfce4/xfconf/xfce-perchannel-xml/xfce4-desktop.xml

.../etc/xdg/xfce4/xfconf/xfce-perchannel-xml/xfce4-panel.xml

.../xfce4/xfconf/xfce-perchannel-xml/xfce4-power-manager.xml

...ce4/xfconf/xfce-perchannel-xml/xfce4-settings-manager.xml

...sation/etc/xdg/xfce4/xfconf/xfce-perchannel-xml/xfwm4.xml

live_exam_os/config/03-customisation/home/user/.profile

live_exam_os/config/03-customisation/home/user/.xinitrc

.../config/03-customisation/usr/local/bin/nexus-exam.desktop

live_exam_os/config/04-post_install/1000-create-user.sh

live_exam_os/config/04-post_install/1000-disable_root.sh

live_exam_os/config/04-post_install/2000-enable_services.sh

live_exam_os/config/04-post_install/9999-firewall.sh

live_exam_os/config/config

live_exam_os/tools/devices_umounter

live_exam_os/tools/devices_watcher

live_exam_os/tools/flash_iso_multi_keys

live_exam_os/tools/umount_multi