network, citra_qt: Give moderation permission to community mods

Based on the `roles` payload in the JWT, the rooms will now give mod permission to Citra Community Moderators. To notify the client of its permissions, a new response, IdJoinSuccessAsMod is added, and there's now a new RoomMember::State called Moderator.

src/citra_qt/multiplayer/client_room.h

@@ -18,7 +18,6 @@ public:
     ~ClientRoomWindow();
 
     void RetranslateUi();
-    void SetModPerms(bool is_mod);
 
 public slots:
     void OnRoomUpdate(const Network::RoomInformation&);
@@ -32,6 +31,7 @@ signals:
 private:
     void Disconnect();
     void UpdateView();
+    void SetModPerms(bool is_mod);
 
     QStandardItemModel* player_list;
     std::unique_ptr<Ui::ClientRoom> ui;