update v20.9

The "Metropolis" update series will include tons of new buildings and elements for your city,  with the goal to supply a complete and realistic city tileset  

Some overall usefull additions before proceeding with a new theme

- Added a Police Post edit of the Parking Booth (+ roof siren and side sign as separate)
- Added a back-view version of the aumatic barrier (not animated yet)
- Added a door animation to both the Police Post and the Parking Booth
- Added some new Parking lots and some new directional arrows for the asphalt

See you and happy game-making! :)