New window classes for OpenRCT2.

new_window.cpp

class TabWindow : Window {
public:
    void AddTab(WindowTab tab);
}

class ParkInformationWindow : TabWindow {
public:
    ParkInformationWindow()
    {
        this->allowMany = false;
    }

    override void OnCreate()
    {
        this->addTab(new WindowTab())
    }
    
private:
    class MainPage : TabPage {
    public:
        override void OnShow()
        {
            this->setMinimumSize(200, 300);
            this->setSize(200, 300);
        }
    }
};