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/twitch/TwitchAccount.hpp

@@ -2,11 +2,9 @@
 
 #include "common/Aliases.hpp"
 #include "common/Atomic.hpp"
-#include "common/Channel.hpp"
 #include "common/UniqueAccess.hpp"
 #include "controllers/accounts/Account.hpp"
 #include "messages/Emote.hpp"
-#include "providers/twitch/TwitchUser.hpp"
 #include "util/QStringHash.hpp"
 
 #include <QColor>
@@ -20,6 +18,10 @@
 
 namespace chatterino {
 
+struct TwitchUser;
+class Channel;
+using ChannelPtr = std::shared_ptr<Channel>;
+
 class TwitchAccount : public Account
 {
 public: