P0-A9: Part 856: Debugging, Improvements

I have made some optimisations to the graphics and performance of the simulation.

I have discovered that the grass system is responsible for a significant performance impact. In some cases, turning off the grass doubled the frame rate.

To solve this, I have added a new graphics options gui which allows users to specify the density and view distance of the grass. In this way, users can adjust the detail of the grass to match their system’s capabilities.

In future, of course, I will need to add far more options for customisation.