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/Updates.cpp

@@ -2,6 +2,7 @@
 
 #include "common/Modes.hpp"
 #include "common/NetworkRequest.hpp"
+#include "common/NetworkResult.hpp"
 #include "common/Outcome.hpp"
 #include "common/QLogging.hpp"
 #include "common/Version.hpp"