Replace Titlebar with NavigationDrawer

[Bubu]

It wastes horizontal space but it's necessary to use modern Android's standard menu implementation.

Better alternative would be to use a NavigationDrawer, so I'll look into this.

[Bubu]

I worked on this a bit a while ago (and subsequently lost a bunch of WiP stuff 🤦). The navigationdrawer didn't really work out that well. I think I rather would go with adding same icons/buttons for the 5 possible menu actions to the game board directly.