[Z-TEST] Office Tower

This is the old floor-plan for the office tower, posted here for anyone who wishes to experiment with their own implementation of z-levels: basement, first floor, second floor, and roof.  I'll json-ize it properly when we have a working z-level contender.

Uses 't_sky' to account for void space!

To find it on the map, you have to search for 'Office'... it is case sensitive.  You'll know you found it because its icons are all capital 'T'