Prevent de-referencing a NULL point
Correctly deal with negative integers in S64 htsp values
Increase the maximum size of paragraphs for OSD rendering from 200 to 4096 characters
Revert back to closing/opening video codec thread on channel changes as the previous solution (keeping the video codec threads running) does not work on newer GPU firmwares due to a failure to adapt to changes in stream format.  This is still not 100% as we are now getting occasional segfaults in the il library when closing the video thread.