Provide default Lyrion configuration upon Snakeoil Installation with stock options

Provide a default LMS configuration when one invokes the /with-lms Snakeoil install option. The default settings will

• Pick material skin as default (Only if this can be done in server prefs)
• Disable "report back" feature
• Disable the metadata plugin
• Music folder will be pointing to /media/music
• Playlists folder will be pointing to /media/playlists

LMS installation via the Snakeoil software page will just install the package and not the configuration. As that will risk overriding any existing configuration.