Changed some areaportals to prevent auto-merging behavior when it's not needed.
Added player clips for stairs where they were not applied in previous versions.
Changed the type of some stairs clips to keep their respective sounds (for example, to keep wooden footstep sound when walking on wooden stairs instead of default concrete sound)
Added more areaportals where they make (or will make) a positive difference.
Added more occluders where they make (or will make) a positive difference.
Updated some occluders to make them cut off more render.
Fixed a few visual issues made in previous versions.
Added missing underground sounds and soundscapes that weren't packed previously. (map size got a bit bigger, of course)

Total FPS boost: up to 14%
Average FPS boost total: 6%

Workshop Item description (and the VMF topic) was also updated.

- Improved map optimization in some places (with average boost of 4-13%)
- Removed some unnecessary cubemaps (map size got a bit smaller)

Fixed the issue with textures of some static props

Fixed the issue where DarkRP was recognizing the owner (world) when there is actually was no entity on the screen

Initial addon creation.