Start the game in a main menu

[ramondelafuente]

The game should start in a main-menu, and have an option to start playing.

This should make it a little easier for us to code the win/loss scenario without global variables. "Restart" should then be "Reload the game room".

It also gives us some options like "run the tests" before any game-specific code has run (because everything affects everything else and we want to run tests in isolation).