[airstrike] make every moving sprite warp

[Erik Auerswald]

Hi,

> > I'd like to have every moving sprite sprite warp when horizontally
> > leaving the level. Especially bullets and to a lesser degree cannonballs
> > should warp IMHO.
> 
> I am not so sure this is a good idea, but maybe you can make it
> configurable in the level settings file?

After some more testing I have to agree, not every sprite should be
warped from one screen edge to the other. Additional warping should be
decided upon for each sprite type individually.

I still think bullets [shot by the biplanes] should warp.

Erik