Support file sizes larger than int.MaxValue
Support file sizes larger than int.MaxValue

Icenium/sharpcompress,weltkante/sharpcompress,tablesmit/sharpcompress,ycaihua/sharpcompress,sepehr1014/sharpcompress,Gert-Jan/sharpcompress,majorsilence/sharpcompress,catester/sharpcompress,adamhathcock/sharpcompress,RainsSoft/sharpcompress,adamhathcock/sharpcompress,adamhathcock/sharpcompress,KOLANICH/sharpcompress,Wagnerp/sharpcompress