Add album in filename template

Author: jerry08

SoundCloudDownloader.Core/Downloading/FileNameTemplate.cs

@@ -16,6 +16,7 @@ public static string Apply(
                 .Replace("$num", number is not null ? $"{number}" : "")
                 .Replace("$id", $"{track.Id}")
                 .Replace("$title", track.Title)
+                .Replace("$album", track.PlaylistName)
                 //.Replace("$author", track.PublisherMetadata.Artist)
                 .Replace("$author", track.User?.Username)
                 .Replace("$releasedDate", DateTime.TryParse(track.ReleaseDate?.ToString(), out DateTime releasedDate) ? (releasedDate.ToString("yyyy-MM-dd") ?? "") : "")

SoundCloudDownloader/Views/Dialogs/SettingsView.xaml

@@ -126,6 +126,9 @@
                                 <LineBreak />
                                 <Run FontWeight="SemiBold" Text="$author" />
                                 <Run Text="- track artist" />
+                                <LineBreak />
+                                <Run FontWeight="SemiBold" Text="$album" />
+                                <Run Text="- track album/playlist name if available. It's only available when downloading tracks from an album/playlist url." />
                             </TextBlock>
                         </DockPanel.ToolTip>
                         <TextBlock