[MOD 0.15] Rocket Turret 0.0.8

[Optera]

I like the idea of adding a slow firing long range turret.
Sadly rocket turrets don't really do that.

Adv Rocket Turret range is just 1m farther than Laser Turret making them rather pointless.
Nuclear Turrets look terribly out of place being just a tinted gun turrets.

I'd merge nuclear turrets with adv/basic rocket turrets using the nice graphics by Yuoki, a range of 20-50 with 90° firing arc and even slower fire rate.