Pickle is not a good tool to save files, it has many security issues.

With the recent developpements, we have moslty removed all the pickle dependence.

The last one that we need to change would the the game saving/loading in the solarsystem.py file. functions save/load_solar_system .

I would suggest to save all the necessary data to a .json format, as it is very easy to interact with.

What do you think about this suggestion ?