I'm pretty sure I got it this time. Cube dropper should now work properly.

Also, accidentally deleted the description. Added back a short version with just the important bits.

- Fixed cube dropper not fizzling cubes

- Some more GLaDOS lines
- Fixed 2 stuck spots

- Another new thumbnail (placeholder)
- Lighting & detail tweaks

- New thumbnail
- Detail & lighting overhaul

Various minor changes, and some silly exploits more or less fixed.

- Removed a voice line left over from the first version

New things:
- The setpiece is now triggered by a trigger_look (with a failsafe for people who walk backwards)
- New branch on the big vent above the chamber
- Hanging cables everywhere
- Some more details in the BTS

Bug fixes:
- Clipped walkways in the entryway
- Fixed stuck spot on the moving button (cubes stuck here are fizzled, too)
- Carried cubes no longer get stuck on portals in the pit
- No longer possible to fire a portal into the observation room

Minor tweaks:
- Some lighting tweaks
- More cubemaps near distant vactubes
- The hanging lamp in the entryway now changes skins