Update 3: Added oil and natural gas — VR Sand Steam update #445829

This update adds oil and natural gas. I think you guys will really enjoy them :) I also fixed ants so they will burrow in dirt, but mostly only multiply in Plant. Finally, I fixed the zooming issue. The tricky part I have with adding new blocks is that since everything is done in a compute shader, the more blocks I add, the more logic needs to be done per step, and this can result in lower performance. This update's performance should still be comparable to before, but it's been tricky navigating this tradeoff, that's what's taken me some time. The main goal I had with a 3D falling sand game is I wanted to be able to make "pipes" and "rivers" and such where you can have water that will actually flow down them. I also wanted the amount of water to be preserved. I decided to not implement any kind of pressure mechanic, which allowed me to have simple local rules, using a sort of "turbulenc...