wip : New explotions

Ok the existing explotion is kind of 1987.

I added a animated pointsprite and used this for testing, but it's really small and not very nice and way to short. http://infobrink.com/free-animated-explosion-on-transparent-background/

We should make some proper explotion sprites I guess.

Also size of ship should matter on the size of the explotion.

To test the 1.6 sec explotion 

Mark a ship then in console: 

```Game.player:GetCombatTarget():Explode()```