[1.0.1c] Fix crashes on initial load — Gourdlets Steam update #231603

This should fix the issue that a small percent of users were experiencing, where the initial loading screen would fill up partway and then the game would crash. It seemed to mostly impact users with AMD graphics, and or people with older model macbooks. The cause of the issue was that the asset textures took up too much memory, which caused the VRAM to spike past the capacity of certain computers. This patch reduces the size of the asset textures, and has a couple other small optimizations to slightly reduce lag. The changes should not noticeably impact gameplay for anyone who was previously able to play the game without any problems.