data class LeaderboardSCallbacks(val onSignInWithGoogle: () -> Unit, val onSignOut: () -> Unit, val onSubmitAchievements: () -> Unit, val onDeleteAccount: () -> Unit, val onRefreshLeaderboard: () -> Unit)
constructor(onSignInWithGoogle: () -> Unit, onSignOut: () -> Unit, onSubmitAchievements: () -> Unit, onDeleteAccount: () -> Unit, onRefreshLeaderboard: () -> Unit)