Disable screen blanking by default via xorg configuration snippet

Further changes:
- add ppa:yavdr/experimental-kodi for KODI 18
- add set-kodi-display script to allow switching DISPLAY in dual
screen configuration (inkompatible with KODI 17)

roles/kodi/tasks/configure-kodi.yml

@@ -35,4 +35,9 @@
       group: '{{ vdr.group }}'    
       mode: "0664"
       force: no
-# TODO: Add configuration files
+
+- name: expand template for set-kodi-display
+  template:
+    src: 'templates/set-kodi-display.j2'
+    dest: '/usr/bin/set-kodi-display'
+    mode: "0755"