Add QAspectRatioLayout borrowed from http://wiki.forum.nokia.com/index.php/CS001309_-_Maintaining_square_form_for_a_widget_in_Qt to maintain width == height * 2 aspect ratio for map drawing widget

team selection completely refactored, now has animation and more performance use a semi transparent black background color (on powerful devices) other smaller improvements and bugfixes

rendering optimisations. remove the recursive flames in explosions (might need more due to the gravity change in the new flames) but more usefully, eliminate a number of redundant Tint calls