Add widgets for settings page, add list to auto position widgets

include/gui/List.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "Widget.hpp"
+#include <vector>
+#include <memory>
+
+namespace gsr {
+    class List : public Widget {
+    public:
+        enum class Orientation {
+            VERTICAL,
+            HORIZONTAL
+        };
+
+        List(Orientation orientation);
+        List(const List&) = delete;
+        List& operator=(const List&) = delete;
+
+        bool on_event(mgl::Event &event, mgl::Window &window, mgl::vec2f offset) override;
+        void draw(mgl::Window &window, mgl::vec2f offset) override;
+
+        void add_widget(std::unique_ptr<Widget> widget);
+        mgl::vec2f get_size() override;
+    protected:
+        std::vector<std::unique_ptr<Widget>> widgets;
+        Orientation orientation;
+    };
+}