Remove Unnecessary Includes in Headers (#4275)

* refactor: remove unnecessary includes in headers

* fix: formatting

* chore: changelog

* fix: scrollbar

* fix: suggestions and old appbase remains

* fix: suggestion

* fix: missing Qt forward declarations

* fix: another qt include

* fix: includes for precompiled-headers=off

* Add missing `<memory>` includes

* Add missing `#pragma once`

* Fix tests

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/providers/twitch/TwitchUser.hpp

@@ -1,6 +1,5 @@
 #pragma once
 
-#include "providers/twitch/api/Helix.hpp"
 #include "util/RapidjsonHelpers.hpp"
 
 #include <pajlada/serialize.hpp>
@@ -11,6 +10,8 @@
 
 namespace chatterino {
 
+struct HelixBlock;
+
 struct TwitchUser {
     QString id;
     mutable QString name;
@@ -24,12 +25,7 @@ struct TwitchUser {
         this->displayName = other.displayName;
     }
 
-    void fromHelixBlock(const HelixBlock &ignore)
-    {
-        this->id = ignore.userId;
-        this->name = ignore.userName;
-        this->displayName = ignore.displayName;
-    }
+    void fromHelixBlock(const HelixBlock &ignore);
 
     bool operator<(const TwitchUser &rhs) const
     {