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)
- use generic media_dirs including vdr recdir, loop over them to
create directories, configure samba, nfs, etc.
- add role to install an configure nfs-kernel-server
- cleanup roles
- add custom fact modules