Movie selection

[knupel]

Find method to select properly the current movie. For now the first movie[which] != nullis selected like a global movie, that's not good because in the future id there fewer item use movie, the first meeting movie became the winner. And that's can be weird and not optimum. The code must be improve here : S_FX_POST.pde method draw_fx() plus it's not a good place to place the algo, but for this time it's not necessary to place this one in an other place.