Add sound and graphics for ship's thrust in Factoroids
completed by: recKz
mentors: David Bruce
When "thrust" is active, display small flames at the back of the ship and play a rumbling rocket engine sound.
(make sure that the above works whether thrust is activated by the up arrow or the right mouse button)
Work from git:
git clone git://git.debian.org/git/tux4kids/tuxmath.git