Small changes regarding StarredAt.

Making StarredAt more "precise", setting it to the time the change was detected.
getStarred.view now returns albums ordered by StarredAt.
loadRange method now take QueryOptions.Desc into account

domain/mediafile.go

@@ -28,6 +28,7 @@ type MediaFile struct {
 	PlayDate    time.Time
 	Rating      int
 	Starred     bool
+	StarredAt   time.Time
 	CreatedAt   time.Time
 	UpdatedAt   time.Time
 }