player currently at front) it will disappear after a given
time (atm 5 seconds).
2) If the ball overtakes the target it will now be deleted.
3) Fixed ball sometimes turning in the wrong direcftion when
trying to hit a kart.
4) Some refactoring to make functions smaller.
5) Removed left-over debug code.
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@9945 178a84e3-b1eb-0310-8ba1-8eac791a3b58