split up code from DialogService into DialogService and SettingsPaneExtensionMethods and moved them to their proper folders
more file location refactorings
added a privacy policy page
slightly modified the PlaybackViewModel to better discern when navigating to it without a parameter (before the value for the parameter was set to 0 whereas now it is set to null)
modified the PlaybackView and playlist item so that at playback a higher quality cover art can be displayed
added the EncodedPassword property to the SubsonicServiceConfiguration class and modified the subsonic service to use it instead of password