Tic Tac Toe

This is a game of tic-tac-toe that uses a class to manage the game logic instead of writing it all with React Hooks.

State managers are declared as read-only class properties and manage a very narrow scope of logic. React components that need to subscribe to state changes would only have to call the hook corresponding to the state manager class (in this case: useSimpleStateValue) with whichever class property of GameInstance that has the relevant logic.