the darsu update

- updated skybox + 3d skybox
- fixed non looping ambience
- one darsu

- fixed broken sprite

- updated thumbnails

- fix texture

- fix?

- added arena's shooting range
- max hideout was updated to be slightly more faithful to current tarkov version + cult room

- updated lighting
- slightly revised layout
- added cult room

- increased level of detail throughout map
- ai nodes now in small room
- small room was slightly revamped

- add thumbnail