Add support for all options of Player.GetOwnedGames#1

[HarryVGI]

You can now modify all options/flags that are available for the Player.GetOwnedGames#1 request.

• include_appinfo is still true by default, but you can turn it off if you don't wish to receive apps' name and icon url
• unvetted apps are skipped by default on Steam side. Sending skip_unvetted_apps=false will include the otherwise skipped apps

After this change, all the previous usages of the SteamUserFriends.getUserOwnedApps method continues to work exactly the same way, but now you can pass in 2 extra options that you previously couldn't.