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/singletons/helper/LoggingChannel.cpp

@@ -1,14 +1,12 @@
 #include "LoggingChannel.hpp"
 
-#include "Application.hpp"
 #include "common/QLogging.hpp"
+#include "messages/Message.hpp"
 #include "singletons/Paths.hpp"
 #include "singletons/Settings.hpp"
 
 #include <QDir>
 
-#include <ctime>
-
 namespace chatterino {
 
 QByteArray endline("\n");

src/singletons/helper/LoggingChannel.hpp

@@ -1,7 +1,5 @@
 #pragma once
 
-#include "messages/Message.hpp"
-
 #include <boost/noncopyable.hpp>
 #include <QDateTime>
 #include <QFile>
@@ -12,6 +10,8 @@
 namespace chatterino {
 
 class Logging;
+struct Message;
+using MessagePtr = std::shared_ptr<const Message>;
 
 class LoggingChannel : boost::noncopyable
 {