Small visual update

Bug fixes
- You can climb through the hole in the window
- The staircase on the staircase no longer blocks progress
- Fixed problems with textures
- Fixed problems with object collision
- Fixed lighting in the kitchen, apartments and more

Addition:
- Purchase area
- Installation area C4
- Invisible walls
- Default gravity value changed from 800 to 200

Created de_mirage rotate 90°.