Bonus: Develop a GUI to setup simulation

Currently, the user is confronted with the simulation screen right away.

Please extend the visualization by a GUI such that:

the user can set up a new simulation with arbitrarily many vehicles (and vehicle types)
the user can see available maps
the user can see available simulations (and use them as a template for new simulations)
the user can download the created simulation as a sim file
the user can see and replay available simulations

Note: some of the functionality is not provided by the back end yet which is OK.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information