Support prev/next browser navigation

[joffrey-bion]

Navigating between routes is something that people naturally do.
We need to respect all possible states in all screens to accommodate for unexpected navigations, and also add better navigation within the application itself to get back to the "expected" route.

Example problems:

• pressing the "back" button from the game browser to go to the homepage: it doesn't properly trigger the home saga and doesn't listen to the change name event anymore (see Homepage unresponsive: sporadic websocket connection timeout #114 and Handle sagas start/stop on browser navigation #116)
• pressing the "back" button while in the lobby: ideally the game should handle this event as a "leave lobby" action, or at the very least the browser screen should respect this state and provide a button to get back to the lobby
• pressing back from the game browser after leaving a game from the score board button. It currently brings us back to the score board, but the game is supposed to be deleted at that moment.