Rideable New Atlantis Transit

Implements fully animated travel system for the New Atlantis Transit, making the Fast Travel optional.

Features:

Rideable, fully animated travel system for the NAT.
Replaces NAT's load door on the right side with a traditional sliding door so you can enter the cabin. Also added a sliding door on the left other side so that the NAT now has doors on both sides.
Replaces NAT's shaded windows with clean transparent windows for a better view on the city.
Added (few) decorations to the interior so the cabin doesn't feel empty.
Misc (practically unnoticable) edits to the tram tracks in New Atlantis (e.g. unobstructed dungeons, automated railway platform gates).

Usage:

Go to the NAT, open the door and approach one of the interactable NAT Interface displays.
There are two NAT Interfaces in the NAT:
1: "Journey": use this one if you'd like to ride (actually travel on) the NAT. Simply face the display and select one of the activate choices. Each one is named after a district e.g. "Commercial District".
2: "Fast Travel": use this one if you'd like to Fast Travel. Upon activating it, the vanilla New Atlantis district selector menu opens so you can quickly travel to another district.

Notes:

If you can change your mind while you're traveling on the NAT, you can activate the Fast Travel NAT Interface anytime to quickly arrive at the destination.

You can travel on the NAT while in combat.