Fixed the world model textures

- Firing sprites make over:
- more consistent colours (less yellow and more orange)
- more natural illumination cast on the original 3D model
- greatly toned down the amount of highlights and removed them from the stock holes so now they're much less distracting

- PDA entry edits: the PDA entry is now roughly 500 words or 2730 characters of flavour text, because I spend way too much time writing stuff. Also added in a FEAR reference I was originally supposed to implement but forgot at launch