update v18.0

"Discord Suggestions" is a short series that will feature random prompts from
the #suggestions channel on our Discord Server.

The aim of this series is to chop down the long suggestion list, without
having to wait a specific theme. 

Each batch will last 5-10 updates and is planned on a bi-monthly basis (~)

-
small update because I was short on time

- Added a door animation to the habitable container and the power house
- Added some missing sprites in the theme files (bus stop + an old condo)
- Updated the theme and single files with the new stuff

See you and happy game-making! :)