Update #16 - Change to asteroid pointer

Changes include: [list] [*] A small change to the asteroid pointer which now points to the nearest asteroid then locks it in until the asteroid is destroyed or despawns due to distance from asteroid being too great. This should help out the early game spazzing out with the asteroid pointer reducing frustration. I didn't know if I wanted to change it but I feel like players spend a decent time in the early game to warrant this. [/list]