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/controllers/commands/CommandController.hpp

@@ -1,11 +1,8 @@
 #pragma once
 
-#include "common/ChatterinoSetting.hpp"
 #include "common/SignalVector.hpp"
 #include "common/Singleton.hpp"
-#include "controllers/commands/Command.hpp"
-#include "controllers/commands/CommandContext.hpp"
-#include "providers/twitch/TwitchChannel.hpp"
+#include "util/QStringHash.hpp"
 
 #include <pajlada/settings.hpp>
 #include <QMap>
@@ -20,8 +17,12 @@ namespace chatterino {
 class Settings;
 class Paths;
 class Channel;
+using ChannelPtr = std::shared_ptr<Channel>;
+struct Message;
 
+struct Command;
 class CommandModel;
+struct CommandContext;
 
 class CommandController final : public Singleton
 {