API changes in Vintasoft.Imaging.Office.OpenXml.dll

New classes:

public class Vintasoft.Imaging.Codecs.Encoders. XlsxEncoder	Defines an encoder for XLSX pages.
public class Vintasoft.Imaging.Codecs.Encoders. XlsxEncoderException	Represents error that occurs during saving XLSX file.

Changed classes:

Vintasoft.Imaging.Office.OpenXml. OpenXmlDocumentConverter
Added methods
	public static void ConvertXlsToXlsx(System.IO. Stream, System.IO. Stream)	Converts the XLS document to XLSX document.
	public static void ConvertXlsToXlsx(string, string)	Converts the XLS document to XLSX document.

Vintasoft.Imaging.Office.OpenXml.Editor. OpenXmlTextInfo
Changed properties
	public string Text { get ; set ; }	public Vintasoft.Imaging.Drawing. DrawingString Text { get ; set ; }
Changed constructors
	public void OpenXmlTextInfo(string)	public void OpenXmlTextInfo(Vintasoft.Imaging.Drawing. DrawingString)
	public void OpenXmlTextInfo(string, Vintasoft.Imaging.Office.OpenXml.Editor. OpenXmlTextProperties)	public void OpenXmlTextInfo(Vintasoft.Imaging.Drawing. DrawingString, Vintasoft.Imaging.Office.OpenXml.Editor. OpenXmlTextProperties)