New QoL feature and HUGE performance upgrade — Cubetory Steam update #5766376

Hello! This release adds a new quality of feature that lets you hover over belts with your mouse to see the path cubes will follow. It's super helpful to help debug your layouts. Furthermore, a large rewrite happened to the rendering. You should see significant FPS increases and less stuttering in the lategame. My PC went from ~30 to about ~120 in my game winning save. Last but not least, some bugs have been fixed. These include an issue where packed cubes would sometimes lose a cube, and a few power grid edge cases that have been resolved.