Create ScreenWidget - a screen aware parent of root widget

api/src/main/java/com/bartlomiejpluta/base/api/game/gui/base/Widget.java

@@ -5,6 +5,8 @@ import com.bartlomiejpluta.base.api.game.screen.Screen;
 public interface Widget {
    Widget getParent();
 
+   void setParent(Widget parent);
+
    float getX();
 
    float getY();

api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/Component.java

@@ -98,6 +98,7 @@ public abstract class Component implements Widget {
       return parent;
    }
 
+   @Override
    public void setParent(Widget parent) {
       this.parent = parent;
    }