Lobby game server methods, OnLobbyGameCreated event, Achievement progress notification Added SetGameServer and GetGameServer for lobby, added OnLobbyGameCreated event in SteamMatchmaking, added SteamId.IsValid check against default ulong value, added SteamUserStats.IndicateAchievementProgress for progress notification. Updated summary for SetGameServer, IndicateAchProg exception Added OnLobbyCreated Added OnLobbyCreated action and handler for associated LobbyCreated_t event Merge pull request #281 from thesupersoup/master Lobby game server methods, OnLobbyCreated and OnLobbyGameCreated, Achievement progress