WorldOLA - Learn while playing

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Our app is now available on iOS as well!

- Add mail sign-in functionality
- Render name initials if no profile pic is present
- Add sign-out functionality (tap on profile pic)
- Add sharing functionality with a message and link to store
- Add sharing functionality of lobby code
- Reward player with 1 coin on correct answers with quiz practice
- Update dependencies
- Remove error message on cancelled Google login