Fix game breakers

Adds:

• Leaderboard for FreeText questions

Fixes:

• Title of the live results still present when routing back to the lobby
• Removed correct answer in the question dialog as long as the countdown is still running
• Prevents the attendee's client from reconnecting to sessions (which resulted in an exception and a console.log error)

Modifies:

• The splashscreen dialog is now 2/3 of the timers length open when starting a quiz round