Add support for WriteProtection (Always Read Only) and MarkAsFinal settings

[PrzemyslawKlys]

This PR fixes:

• https://github.com/EvotecIT/OfficeIMO/issues/162

AlwaysOpenReadOnly

internal static void Example_ProtectAlwaysReadOnly(string folderPath, bool openWord) {
    Console.WriteLine("[*] Creating standard document with protection 'Always Read Only'");
    string filePath = System.IO.Path.Combine(folderPath, "Basic Document with always read only protection.docx");
    using (WordDocument document = WordDocument.Create(filePath)) {
        var paragraph = document.AddParagraph("Basic paragraph - Page 4");
        paragraph.ParagraphAlignment = JustificationValues.Center;
        paragraph.Color = SixLabors.ImageSharp.Color.Blue;
        paragraph.AddText(" This is continutation in the same line");

        Console.WriteLine("Always read only: " + document.Settings.AlwaysOpenReadOnly);

        document.Settings.AlwaysOpenReadOnly = true;

        Console.WriteLine("Always read only: " + document.Settings.AlwaysOpenReadOnly);

        document.Save(true);
    }
}

FinalDocument

internal static void Example_ProtectFinalDocument(string folderPath, bool openWord) {
    Console.WriteLine("[*] Creating basic document with protection - Final Document");
    string filePath = System.IO.Path.Combine(folderPath, "Basic Document with setting Word to Final Document.docx");
    using (WordDocument document = WordDocument.Create(filePath)) {
        var paragraph = document.AddParagraph("Basic paragraph - Page 1");
        paragraph.ParagraphAlignment = JustificationValues.Center;
        paragraph.Color = SixLabors.ImageSharp.Color.Blue;
        paragraph.AddText(" This is continutation in the same line");
        paragraph.AddBreak(BreakValues.TextWrapping);

        Console.WriteLine("Final document: " + document.Settings.FinalDocument);

        document.Settings.FinalDocument = true;

        Console.WriteLine("Final document: " + document.Settings.FinalDocument);

        document.Save(openWord);
    }
}