add imgui support

include/client/states/MainMenuState.h

@@ -2,11 +2,12 @@
 
 #include <Nazara/Widgets/ButtonWidget.hpp>
 #include <client/states/AbstractState.h>
+#include <client/states/ImGuiDrawer.h>
 
 namespace blitz {
 namespace client {
 
-class MainMenuState : public AbstractState {
+class MainMenuState : public AbstractState, private ImGuiDrawer {
   public:
 	MainMenuState(std::shared_ptr<StateData>);
 	~MainMenuState();
@@ -21,6 +22,8 @@ class MainMenuState : public AbstractState {
 	void LayoutWidgets() override;
 	bool Update(Nz::StateMachine& fsm, Nz::Time elapsedTime) override;
 
+	void OnRenderImgui() override;
+
 	void OnJoinServerPressed();
 	void OnCreateServerPressed();
 	void OnOptionPressed();