Particles and lights

So quite a few things today. 

• A 'new'  bonus appearing : the quick reload
• I updated the player light so that it gives you some feeling about your current ammo and when you are ready to shoot 
Basically it gets dimmer as you shoot, goes dark very briefly when you start to reload, and goes to full brightness 'suddenly' when you are again ready to shoot

• Now we have sparkles on the explosions. 
The speed and lifetime has a gaussian distribution They are heavily biased toward a vertical or horizontal direction.