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/network/verify_user.h

@@ -13,6 +13,7 @@ struct UserData {
     std::string username;
     std::string display_name;
     std::string avatar_url;
+    bool moderator = false; ///< Whether the user is a Citra Moderator.
 };
 
 /**