Additional sounds

I added some more sounds, at times they become annoying or too much but that may be due to listening to them for too much while working on the game. Let me know if anyone has any insights about it.

Full changelog:

Added thruster sound to player;
Added blink and hit sound to mines;
Added asteroid fragmentation sound;
Decresed distance at which sounds are audible;

Tweaked some sounds to make them less annoying/painful (let me know if some still are);