Return file name safe from illegal file system characters

MakeSafeFile.cs

static string MakeSafeFileName(string name, char replaceChar = '_')
{
    var temp = name;
    
    foreach (var character in Path.GetInvalidFileNameChars().Concat(Path.GetInvalidPathChars()))
    {
        temp = temp.Replace(character, replaceChar);
    }
    
    return temp;
}