Scavengerhunt UI updates

[eccheung4]

• Updated UI
• Answers saved when switching views
• Added leaderboard
• Time remaining
• handle url params (game=contract address, q=question index, a=answer), that will load game at that address and q/a will fill in input for user

Is there QR code creator in the burner wallet?
QR code scanner example to possibly just scan q/a string instead of loading a url?

Things to Do:

• Handle QR code scanning and generation
• After owner reveals answers, let user know what answers they got correct and need to reveal to get point.

[eccheung4]

1. I've added handling for QR code scanning, idea being that when they find answer to question, they may be a QR code that they can just scan and it will fill in the answer or load the scavenger hunt contract as well
   QRCode: game=0xContractAddress&q=1&a=helloworld
   q - question index
   a - answer

2. Added some logic to only allow user to reveal answer for ones they got right and show correct answer for ones they got wrong

Things to do:

• using simple alert() currently for some messages, would like to use some sort of better notification

[eccheung4]

• used changeAlert for notifications

@austintgriffith Hope you're doing well after a long blockchain week. I think the UI is in a fairly good state. I was wondering if there is a way to deploy the contract with xDai in one transaction? Otherwise, I could deploy the contract, then when its deployed I can trigger another transaction to send xDai to it. I'll need to add an input field for this. Once this is done, I can create a demo video with the latest updates.

[eccheung4]

I think this can be merged

[eccheung4]

Demo: https://www.youtube.com/watch?v=30hiLtOjVyU
I have a medium post describing it a bit more and I'll create another PR if there are more fixes.