Render x/y for UI elements.

src/ui/rectangle.h

@@ -16,6 +16,6 @@ void rectangleInit(rectangle_t *rectangle);
 
 void rectangleSetColor(rectangle_t *rectangle, pixel_t color);
 
-void rectangleRender(rectangle_t *rectangle, shader_t *shader);
+void rectangleRender(rectangle_t *rect, shader_t *shader, float x, float y);
 
 void rectangleDispose(rectangle_t *rectangle);