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/messages/Message.hpp

@@ -1,11 +1,10 @@
 #pragma once
 
 #include "common/FlagsEnum.hpp"
-#include "providers/twitch/TwitchBadge.hpp"
 #include "util/QStringHash.hpp"
-#include "widgets/helper/ScrollbarHighlight.hpp"
 
 #include <boost/noncopyable.hpp>
+#include <QColor>
 #include <QTime>
 
 #include <cinttypes>
@@ -15,6 +14,8 @@
 namespace chatterino {
 class MessageElement;
 class MessageThread;
+class Badge;
+class ScrollbarHighlight;
 
 enum class MessageFlag : int64_t {
     None = 0LL,