Fix flickery drags. Tweak translucent drop shadows.
Detail: s/Drag - When moving the dragged sprite, avoid plotting over the top of its old location in order to prevent flicker caused by overdraw. This flicker wasn't so apparent with the older translucent or hatched sprite plotting, but is a lot more noticeable with ABGR sprites. s/StartUp - Use 50% alpha for the ABGR sprite in true colour modes, to match hatching & non-drop shadow variants. Also make the drop shadow completely invisible when behind the sprite - better than having it there but making it almost completely imperceptible in order to try and hide the fact that it always looks a bit funny Admin: Tested on Iyonix Version 0.19. Tagged as 'DragASprit-0_19'
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