Update Screen system

Added FuelScreen (Working buttons)
Added SellScreen (Nothing working)

Game/Gui/Screens/FuelScreen.cpp

@@ -0,0 +1,10 @@
+#include "FuelScreen.h"
+FuelScreen::FuelScreen(const std::string& filePath, Point2f pos, Point2f size, TextureManager* manager): Screen(filePath, pos, size, manager)
+{
+}
+void FuelScreen::Draw() const {
+	Screen::Draw();
+}
+void FuelScreen::Update(float elapsedSecs) {
+	Screen::Update(elapsedSecs);
+}