Instancing changes and minor hotfixes

- Fixed a space tile under an airlock at the Vox Outpost
- Fixed areas on the Asteroid
- Modified instances of floor tiles (wooden and regular) and grilles to
be broken whenever applicable at roundstart
- Added lightswitches to some rooms in the Research Outpost. Areas need
to be cut up further in all other areas
Re-introduce welding supplies closet
Merge pull request #1878 from dylanstrategie/Mapping

Instancing changes and minor hotfixes