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/controllers/nicknames/NicknamesModel.cpp

@@ -1,9 +1,6 @@
 #include "controllers/nicknames/NicknamesModel.hpp"
 
-#include "Application.hpp"
 #include "controllers/nicknames/Nickname.hpp"
-#include "providers/twitch/api/Helix.hpp"
-#include "singletons/Settings.hpp"
 #include "util/StandardItemHelper.hpp"
 
 namespace chatterino {

src/controllers/nicknames/NicknamesModel.hpp

@@ -4,6 +4,8 @@
 
 #include <QObject>
 
+#include <vector>
+
 namespace chatterino {
 
 class Nickname;
@@ -15,12 +17,12 @@ public:
 
 protected:
     // turn a vector item into a model row
-    virtual Nickname getItemFromRow(std::vector<QStandardItem *> &row,
-                                    const Nickname &original) override;
+    Nickname getItemFromRow(std::vector<QStandardItem *> &row,
+                            const Nickname &original) override;
 
     // turns a row in the model into a vector item
-    virtual void getRowFromItem(const Nickname &item,
-                                std::vector<QStandardItem *> &row) override;
+    void getRowFromItem(const Nickname &item,
+                        std::vector<QStandardItem *> &row) override;
 };
 
 }  // namespace chatterino