I think components.cpp/h should be moved to the gui folder.
Also the rendering methods for components should be moved from the Renderer class to their component class. For example, Renderer::renderButton should be moved to GraphicButton::render. This should make it easier to replace with a GUI library and also makes calling simpler. ie in menu_state_root.cpp "renderer.renderButton(&buttonNewGame);" becomes "buttonNewGame.render();"
computeCenteredPos and Renderer::renderText should be moved to GraphicComponent class. renderText is called in Renderer::renderResourceStatus but other than that I couldn't see any problems moving the methods.
It might even be slightly quicker since it wouldn't need to call the getX() sort of methods, although, they might be inlined.
