Co-op playtest update (version 0.17.5)

- Disabled upgrade button (sorry, it was not meant to be included as the content is not yet fully functional)
- Fixed a bug that allowed to move through walls during the upgrade cutscene
- Fixed calculating shelter cleanliness
- Players are no longer levitating :D
- Fixed application buttons inside tablet to be sucked in a pressed state
- Fixed on/off states of lights inside rooms
- Fixed map tasks spawning
- Implemented colliders for support structures