0.2.54.2 (EXPERIMENTAL) - Engine upgrade — Sprocket Steam update #3047840

Hi all, There's a build up on the experimental branch with a game engine update, bringing the game up to speed with 4 years of engine changes and fixes. This is necessary for some engine changes and fixes needed for the GUI overhaul. A rework on foliage rendering was needed after the engine upgrade, so I took some time to give it a polish while I got it working again. Changes Upgraded from Unity 2022.3 to 6000.3 Improved the appearance of terrain in Sandbox, Railway, Fields. Improved appearance of grass and trees. Improved the appearance of rivers and lakes in the sandbox. Fixed flicker when switching to and from scope view. Reduced popping of levels of detail for trees and grass. Fixed vehicles having incorrect collision with some trees. Screen-space global illumination can now be enabled, this mainly improves the look of foliage. Added a grass distance and density setting. Added a shad...