refactor: Twitch PubSub client (#5059)

* Remove unused `setAccountData` function

* Move PubSub out of TwitchIrcServer and into Application

* Add changelog entry

* fix: assert feedback

* Add PubSub::unlistenPrefix as per review suggestion

* Fix tests

* quit pubsub on exit

might conflict with exit removal, so can be reverted but this shows it's possible

* Don't manually call stop on clients, it's called when the connection is closed

* nit: rename `mainThread` to `thread`

* Join in a thread!!!!!!!!

src/providers/twitch/TwitchIrcServer.cpp

@@ -1,4 +1,4 @@
-#include "TwitchIrcServer.hpp"
+#include "providers/twitch/TwitchIrcServer.hpp"
 
 #include "Application.hpp"
 #include "common/Channel.hpp"
@@ -13,7 +13,6 @@
 #include "providers/twitch/api/Helix.hpp"
 #include "providers/twitch/ChannelPointReward.hpp"
 #include "providers/twitch/IrcMessageHandler.hpp"
-#include "providers/twitch/PubSubManager.hpp"
 #include "providers/twitch/TwitchAccount.hpp"
 #include "providers/twitch/TwitchChannel.hpp"
 #include "singletons/Settings.hpp"
@@ -29,7 +28,6 @@ using namespace std::chrono_literals;
 
 namespace {
 
-const QString TWITCH_PUBSUB_URL = "wss://pubsub-edge.twitch.tv";
 const QString BTTV_LIVE_UPDATES_URL = "wss://sockets.betterttv.net/ws";
 const QString SEVENTV_EVENTAPI_URL = "wss://events.7tv.io/v3";
 
@@ -43,7 +41,6 @@ TwitchIrcServer::TwitchIrcServer()
     , liveChannel(new Channel("/live", Channel::Type::TwitchLive))
     , automodChannel(new Channel("/automod", Channel::Type::TwitchAutomod))
     , watchingChannel(Channel::getEmpty(), Channel::Type::TwitchWatching)
-    , pubsub(new PubSub(TWITCH_PUBSUB_URL))
 {
     this->initializeIrc();
 
@@ -72,7 +69,6 @@ void TwitchIrcServer::initialize(Settings &settings, Paths &paths)
     getApp()->accounts->twitch.currentUserChanged.connect([this]() {
         postToThread([this] {
             this->connect();
-            this->pubsub->setAccount(getApp()->accounts->twitch.getCurrent());
         });
     });