adding new BasicUIElements (groups and score) and made tweaks to the joystick and button.

Added BasicUIGroup and BasicUIScore for creating horizontal or vertical groups of UI elements, and then adding them to the BasicUILayout. Adjusted BasicUIElement to allow content textures to be updated (for score and keys for example). Tweaked the joystick and button to scale with the view (this needs to be refined).

i am updating the multiresolution example to show how these work