Management, update arduino, add initial webapp

raspi/mgmt/autostart

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+@xset s noblank
+@xset s off
+@xset -dpms

raspi/mgmt/playbook.yml

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+- hosts: raspi
+  become: True
+  become_user: root
+  tasks:
+    - copy: src=autostart dest=/home/pi/.config/lxsession/LXDE-pi/autostart
+    - copy: src=sejf.desktop dest=/etc/xdg/autostart
+    - apt: name=python-flask state=present

raspi/mgmt/sejf.desktop

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+[Desktop Entry]
+Type=Application
+Name=sejf
+NoDisplay=true
+Exec=python /home/pi/sejf/raspi/pySejf.py
+Terminal=true
+NotShowIn=GNOME;KDE;XFCE;