Ghostscript.NET 1.2.1

Fixed offset error in StdIn buffering. Fixed problem with keeping whitespace return from the StdIn callbacks. Fixed problem with GhostscriptProcessor and current page handling event. Fixed problem with PDF signature/marker not beeing within first 32 bytes. Fixed problem with System.ArgumentOutOfRangeException when StdOut message does not occur at beginning of the line. Fixed problem with Amazon.Runtime.Internal.Util.HashStream.Position throw NotSupportedException. Added ability to allow keeping native ghostscript instance within GhostscriptProcessor instance and reuse it avoiding multiple library load/free especially when loaded from memory. GhostscriptRasterizer - added a constructor to allow capture of IO using GhostscriptStdIO (Rasterizer samples updated with example of using GhostscriptStdIO) GhostscriptViewer - added GridFitTT=0 to improve text quality. GhostscriptViewer - added public setter for DPI settings in viewer. GhostscriptViewre - change zoom method to public. GhostscriptViewer - set test to false by default in Zoom method. GhostscriptViewer - changed ShowAfterOpen to public to set parameters without having to generate a pdf