Police Helicopter City Flying

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- Improved skybox quality whilst also reducing its size
- Reduce file size by an extra 12MB
- Fixed blurry helicopter texture
- Fixed a lot of materials using bad or expensive shaders
- Changed tree shaders so they'll now batch and also have much better performance
- Changed tree bark texture because previous one looked too white
-Removed billing permissions
- Textures, audio etc compressed bringing filesize down massively