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/LinkResolver.hpp

@@ -1,14 +1,17 @@
 #pragma once
 
-#include "messages/Image.hpp"
-#include "messages/Link.hpp"
-
+#include <QObject>
 #include <QString>
 
 #include <functional>
+#include <memory>
 
 namespace chatterino {
 
+class Image;
+struct Link;
+using ImagePtr = std::shared_ptr<Image>;
+
 class LinkResolver
 {
 public: