sfrem/prototype-floor (#8)

This PR creates the floor and adds a couple of things along with it.

Note that this floor is not exactly "playable". You can walk around and you're inside of a big empty space with a glass at the top, but there's nothing to do inside of it, and the lighting could use a lot of work.

Getting this in now so that more work can be done to it.

View from inside the tower: <img width="1475" alt="image.png" src="attachments/56ab5066-2d8e-4137-93ee-9aebfcfe6ada">

Closes #3

Reviewed-on: #8
Reviewed-by: indigoso <indigosowhat@gmail.com>
Co-authored-by: godsfryingpan <sfrembling@gmail.com>
Co-committed-by: godsfryingpan <sfrembling@gmail.com>

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