Rework UI again

[PowerfulBacon]

Have a react style UI system.

class ExampleState : State
{

}

class ExampleUserInterface : UserInterface<ExampleState>
{
    override void Render()
    {
        return new UserInterfaceComponent(...);
    }
}

Updating the state will re-call render

[PowerfulBacon]

The idea is that the current UI represents HTML, but we need to be able to make the UI able to react to contextual information changes better.