Log-In for Users

[laurafulton]

Info Needed to Track: introduce log-in for tracking the same user data from multiple games

[adamperer]

Investigate Google Authentication to solve this feature.

[yzd1998111]

Added the google sign-in button for the app and tested locally that after sign in, the game is able to retrieve my google acct profile.

After sign-in, the button changes to display "signed-in" and clicking it again or close the page automatically logs the user out.

[adamperer]

@yzd1998111 can you deploy this update to GCP, so we can see how it behaves?

[adamperer]

@yzd1998111 Also, show result of logged-in user by renaming Player 1's name and profile to the logged-in user.

[yzd1998111]

The loading screen now uses google acct profile image and name as the player's name/profile. If the user does not sign in, the default profile img/name is used. The old way of creating those players had some anti-patterns against React. (Players array is passed from parent to children and modified without making a deep copy, causing many weird bugs when I tried to add this new feature.)