Return vector containing all game files matching download filters

Get list of games from account page

Initialize the API returns 0 if failed returns 1 if successful */

Load game details from cache file returns 0 if successful returns 1 if cache file doesn't exist returns 2 if JSON parsing failed retur

Repair file

Save game details to cache file returns 0 if successful returns 1 if fails */

Create GOG XML

Extract file returns 0 if successful returns 1 if input file could not be opened returns 2 if compression method is unsupported return

Extract stream to stream returns 0 if successful returns 1 if input stream is not valid returns 2 if compression method is unsupported

Overrides global settings with game specific settings returns 0 if fails returns number of changed settings if succesful */