Foxit Reader 3.0.1817

1. Fixed a problem related to negative stream offset (in malicious JPEG2000 stream) which caused reading data from out-of-bound address. We added guard codes to solve this issue;

2. Fixed a problem related to error handling when decoding JPEG2000 header, an uncaught fatal error resulted a subsequent invalid address access. We added error handling code to terminate the decoding process.