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/widgets/dialogs/ColorPickerDialog.hpp

@@ -1,17 +1,24 @@
 #pragma once
 
-#include "util/LayoutCreator.hpp"
 #include "widgets/BasePopup.hpp"
-#include "widgets/helper/ColorButton.hpp"
-#include "widgets/helper/QColorPicker.hpp"
 
 #include <pajlada/signals/signal.hpp>
 #include <QLabel>
+#include <QLineEdit>
+#include <QRegularExpressionValidator>
 
 #include <array>
 
 namespace chatterino {
 
+class ColorButton;
+class QColorLuminancePicker;
+class QColorPicker;
+class QColSpinBox;
+
+template <class T>
+class LayoutCreator;
+
 /**
  * @brief A custom color picker dialog.
  *