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/emoji/Emojis.cpp

@@ -1,9 +1,10 @@
 #include "providers/emoji/Emojis.hpp"
 
-#include "Application.hpp"
 #include "common/QLogging.hpp"
 #include "messages/Emote.hpp"
+#include "messages/Image.hpp"
 #include "singletons/Settings.hpp"
+#include "util/RapidjsonHelpers.hpp"
 
 #include <boost/variant.hpp>
 #include <QFile>
@@ -11,6 +12,7 @@
 #include <rapidjson/error/error.h>
 #include <rapidjson/rapidjson.h>
 
+#include <array>
 #include <memory>
 
 namespace chatterino {