Beta update, Gallery overhaul — Bad Memories Steam update #1161071

Sorry, this is not a content update. This time I changed the Gallery code so much, it's basically a complete overhaul. I've tested everything and had a few other people try it by sending them the new gallery script and everything seems to work, but without updating the full game (several script-files have changed and some image names), I can't really be a 100% sure, so to the Beta branch it goes.I've had a lot of trouble with the old gallery, the code was a mess (well it still is tbh, but it's a lot better than before), it desperately needed an overhaul, so I did that, changed a lot of code, optimised a few things, shortened and/or combined some of the code, changed the design slightly, etc..There are also a few new images and some that I had to change/replace, since there was no possible way to get them without using the dev console, for those you might need to replay the specific scene...