Descent Update 10-4-21

Changelog:

Suggested by CalumTraveler:

* Given the avatar reflection can't seem to be fixed, I'm lowering the visibility of the reflection to see if that works better.
* Fixed a seam in the rock wall at the bottom of the shaft.
* Added tops to the struts along the rock wall.
* Another attempt to adjust the lower tunnel's collision (hope it works!)
* Fixed intersecting collision at the start of the spiral path at the bottom.
* Adjusted spiral path mesh to be a bit less jarring as the path grows wider.

Suggested by TGMChrist:

* Fixed some UV mapping at the bottom level of the Great Shaft and under the raised floor.

Suggested by cjherkeless:

* Adjusted collision around lower pillars to keep avatar in bounds.
* Sealed the back walls of the D'ni text pillars.
* More adjustments to bottom of lower elevator struts.
* Replaced unnatural darkness near D'ni text pillars (it was just an all black texture)
* Added new collision for both avatar and camera behind D'ni text pillar at stairs leading up to elevator.
* Blocked off walls between main chamber and blue/yellow button rooms.
* Removed a bit of collision that may have been affecting the avatar and camera (and adjusted some to help with the latter) in the Ti'ana cave.
* Added a camera collider to entrance from Ti'ana cave to tunnels. Note that we've been having trouble with all Ages with low ceilings and the first person camera, so this fix may not be possible at this time without adjustments to the client or PhysX itself.
* Gave collision to node 1 door's upper ring.
* Added collision for top outer ring of Great Shaft past the railing.