Add new PrefSortTags option (#2696)

conf/configuration.go

@@ -51,6 +51,7 @@ type configOptions struct {
 	DefaultDownsamplingFormat    string
 	SearchFullString             bool
 	RecentlyAddedByModTime       bool
+	PreferSortTags               bool
 	IgnoredArticles              string
 	IndexGroups                  string
 	SubsonicArtistParticipations bool
@@ -296,6 +297,7 @@ func init() {
 	viper.SetDefault("defaultdownsamplingformat", consts.DefaultDownsamplingFormat)
 	viper.SetDefault("searchfullstring", false)
 	viper.SetDefault("recentlyaddedbymodtime", false)
+	viper.SetDefault("prefersorttags", false)
 	viper.SetDefault("ignoredarticles", "The El La Los Las Le Les Os As O A")
 	viper.SetDefault("indexgroups", "A B C D E F G H I J K L M N O P Q R S T U V W X-Z(XYZ) [Unknown]([)")
 	viper.SetDefault("subsonicartistparticipations", false)