samba: add support for user-defined shares in .config/samba.shares.d/
samba: remove support for /storage/.config/samba.conf
- we have usershares support now
- we have a "defaults" problem when updating our smb.conf
- users have no job messing up with defaults. if something is
  broken with defaults it must be fixed.
kodi: pre-create /storage/recordings
vdr-addon: move videodir to /storage/recordings