Backgrounds tool added. The way it works on PS1 is kind of complicated, so i'm not going to fully export all the data. Here's how it works:
you need 3 files to provide for it:
1 - background (from folder 6)
2 - palette (from folder 9), this file is usually first palette, and its size is the biggest, 16384 (other palettes will be smaller, they are for models)
3 - memory.dat file from the root of the folder
(you need to re-unpack assets from room packages with updated Parasite_assets.exe)
Once you run it like
Parasite_bg.exe <background> <palette> <memory.dat>
it will make a "tex" folder with all layers, and a few combined images, which are final backgrounds. Most of the time there are 1, 2 or 3 of them: one big background and 1 or 2 closeups. Some layers may exceed final background size, and i decided to export them with those oversized parts, so you can see them too. Tool will also make a list of which layers are animated and how.
Some backgrounds are using PS1 semi-transparent modes. About 8 of them have "normal" transparency, like the one with police car ride. About 6 with darkening (shadows), like menus with help. And only 1 most special with 2 types, which is magic carriage ride. That one has both a shadow and semi-transparent flame ahead of carriage.
Technically i could get all these transparency modes properly, but i think its not needed, because its possible to combine all needed parts from layers.