Update creatureevent.cpp

Added Creatureevent onTarget(cid, target)

It has not been tested, since i cant compile 1.0.

Also im have 10% knowlegde about c++, since the progress of adding new features going slow, i will do it. But before i go ahead, need Mark to check if ive done right, also do i need edit other places to make this even work? or is it enough with creatureevents/.cpp/.h