[Adonthell-general] Start a new game without exiting the app

[Clément Plantier]

Hi! It's me again...

I don't know if this is relevant to the engine or to Waste's Edge, but I
think that it would be nice if, when playing, we could close the current
game in order to start a new one by returning to the main menu.
Currently we just can quit the whole app, and we have to restart it
again to play a new game.

(French translation : 32%. It's very long...)

Bye