Changelog:
- Added lighting propagation between rooms from natural light
- Balanced furniture environment addition
- Improved lowered walls, now depends on cutoff shader instead of directly scaling the walls
- Fixed bug in navmesh generation code
- Fixed bug in room splitting code
- Fixed being able to clone room and place it inside another room
- Fixed server code causing long save game loading times
- Fixed game hanging when disconnecting a head server from a server cluster