changes who the lobby owner is
you must be the lobby owner for this to succeed, and steamIDNewOwner must be in the lobby
after completion, the local user will no longer be the owner
public static bool SetLobbyOwner(CSteamID steamIDLobby, CSteamID steamIDNewOwner) { InteropHelp.TestIfAvailableClient(); return NativeMethods.ISteamMatchmaking_SetLobbyOwner(steamIDLobby, steamIDNewOwner); }