Optimization

[AlexWills37]

This is a list of changes that we can make to improve the game's framerate

• Reduce light beam particles
• Reduce seagrass particles
• Change which objects cast/show shadows
• Remove some trees
• Set water quality from 'medium' to 'low'
  > 3-5 fps boost, and fixes issue with water being transparent in one eye
• Change the terrain model
• Improve waving seagrass