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/MessageBuilder.hpp

@@ -1,10 +1,12 @@
 #pragma once
 
-#include "messages/MessageElement.hpp"
+#include "messages/MessageColor.hpp"
 
 #include <QRegularExpression>
+#include <QTime>
 
 #include <ctime>
+#include <memory>
 #include <utility>
 
 namespace chatterino {
@@ -16,6 +18,11 @@ struct AutomodInfoAction;
 struct Message;
 using MessagePtr = std::shared_ptr<const Message>;
 
+class MessageElement;
+class TextElement;
+struct Emote;
+using EmotePtr = std::shared_ptr<const Emote>;
+
 struct SystemMessageTag {
 };
 struct TimeoutMessageTag {