Updated lgogdownloader to 3.1.

LGOGDownloader 3.1
- Make libcurl usage thread-safe (Patch by: Philipp Kerling)
* libcurl internally uses signals by default, which will crash the application when using multiple threads.
* Setting CURLOPT_NOSIGNAL on all handles avoids the crashes and is recommended in the libcurl documentation.
- Made getTerminalWidth detect if it is running in a terminal before trying to get the width (Patch by: Steffan Byrne)
* Before this change, if you tried to pipe the standard out to a file or run this as a process, it would fail.
- Moved global curl init/cleanup and ssl thread setup out of the Downloader class
* Allows using libcurl calls before calling Downloader::init() which can be useful in future
- Some code restructuring
* Moved some code from Downloader::init() to constructor
* Added function API::isLoggedIn()
* Added function Downloader::isLoggedIn()
* Downloader::init() no longer calls Downloader::getGameList() it is now called from other functions when needed
- Fixed some login issues
- Limit download thread count to number of items in download queue
- Rewrote and removed lots of duplicate code from Downloader::checkStatus()
* --status now tries to get remote file hash for patches and language packs
* GOG doesn't provide xml data for extras so we still have to rely on local xml data for those
- Made --list show number of updates for games that have been updated
* Allows user to check for updated games more easily
- Replaced all printf and sprintf calls using new Util::formattedString() function
* Util::formattedString creates formatted std::string using std::snprintf
* Fixes possible buffer overflow in Downloader::printProgress() caused by sprintf call

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