Improve background display (Patreon)

The background graphics are structured as sequential frames as shown above, but it seems to load all of them at once and take time to complete loading. So probably it has caused background-related bugs.So, instead of placing the images on the frame, I changed to loading external jpg files each time, just like custom backgrounds. This should at least eliminate the rapid switching bug, and save memory consumption.And I fixed the shutter button on the camera studio stage which has not worked, although I'm sure few of you have noticed.

Also, regarding the hair color bug I reported last time, I'm working on a tool to initialize only the hair color so that you don't have to initialize the entire Girl settings after update, but I just can't get this to work...