Update v1.2

After some feedback about continued performance issues, I took the time to review and profile the engine and found some major bottlenecks that are now resolved. Performance is now much, much better. Some visual effects were added too. The full change list is:

• Improved performance
• Added vignette screen effect
• Added chomatic aberration screen effect
• Adjusted the shuttle's light to make the beam wider and easier to see in the dark