Increase tag template options for contributor and series types

- Add template tag support for multiple series
- Add series ID and contributor ID to template tags
- <first author> and <first narrator> are now name types with name formatter support
- Properly import contributor IDs into database
- Updated docs

Source/LibationFileManager/Templates/SeriesDto.cs

@@ -0,0 +1,27 @@
+using System;
+
+#nullable enable
+namespace LibationFileManager.Templates;
+
+public record SeriesDto : IFormattable
+{
+	public string Name { get; }
+
+	public float? Number { get; }
+	public string AudibleSeriesId { get; }
+	public SeriesDto(string name, float? number, string audibleSeriesId)
+	{
+		Name = name;
+		Number = number;
+		AudibleSeriesId = audibleSeriesId;
+	}
+
+	public override string ToString() => Name.Trim();
+	public string ToString(string? format, IFormatProvider? _)
+		=> string.IsNullOrWhiteSpace(format) ? ToString()
+		: format
+		.Replace("{N}", Name)
+		.Replace("{#}", Number?.ToString())
+		.Replace("{ID}", AudibleSeriesId)
+		.Trim();
+}