Massage includes some more (#4294)

* Add `<functional>` include to QStringHash.hpp

This ensures the base `std::hash` template is declared before this
specialization

* Add missing includes to `src/providers/twitch/TwitchAccountManager.hpp`

* Move explicit HelixChatters constructor to the source file

* Remove unused includes & add used includes to NicknamesModel.hpp

* NicknamesModel.hpp: Remove `virtual` when `override` is used

* Add missing QStringHash include to TwitchEmotes.cpp

* Add missing includes to various files

* Print Qt version in cmake step

Technically unrelated, but I'm sneaking it in

* Add changelog entry

src/providers/twitch/api/Helix.hpp

@@ -357,20 +357,7 @@ struct HelixChatters {
 
     HelixChatters() = default;
 
-    explicit HelixChatters(const QJsonObject &jsonObject)
-        : total(jsonObject.value("total").toInt())
-        , cursor(jsonObject.value("pagination")
-                     .toObject()
-                     .value("cursor")
-                     .toString())
-    {
-        const auto &data = jsonObject.value("data").toArray();
-        for (const auto &chatter : data)
-        {
-            auto userLogin = chatter.toObject().value("user_login").toString();
-            this->chatters.insert(userLogin);
-        }
-    }
+    explicit HelixChatters(const QJsonObject &jsonObject);
 };
 
 using HelixModerator = HelixVip;