Add controls for when friends and non-friends can sent party invites.

[GoogleFrog]

Options should be always/not ingame/never.

[Licho1]

Where these controls go? I believe this is something that server should be handling in a way? Or you just want to silently ignore those?

[GoogleFrog]

I'd just silently ignore them lobby-side. The server version would have players send their settings, store it in a database, and then have the server say "this player is ingame and not your friend, so they have disabled invites for you". The server side solution would be better, but perhaps a bit much.

[sprunk]

Server doesn't (or at least probably shouldn't) even know somebody is ingame if it's not multiplayer (e.g. skirmish, campaign)