Improve destinations handling in RTF parser

Author: manfromarce

src/DocSharp.Docx/RtfToDocx/RtfDestination.cs

@@ -4,9 +4,17 @@ internal class RtfDestination : RtfGroup
 {
 	public string Name { get; }
 
-	public RtfDestination(string name)
+	// Set to true if the destination starts with '*'
+	public bool IsIgnorable { get; }
+
+	// Special destinations such as pnseclvl can have a numeric parameter
+	public int? Value { get; set; }
+    public bool HasValue { get; set; }
+
+	public RtfDestination(string name, bool isIgnorable = false)
 	{
 		Name = name ?? string.Empty;
+		IsIgnorable = isIgnorable;
 	}
 }