Improve "next payout" on game view

[descartes1596]

The Chore

This next payout info is hard to interpret.

Either we need to add the epoch counter to this page so its easy to tell how far away it is, or we use the epoch time to say "in 4 hours" etc.

Tasks

• Change text to "Next payout in"
• Display "X hours" by looking at the next payout epoch and multiplying by epoch length from network params to work out how many hours that is in. Ideally this should also account for however many hours into the current epoch you are.

Additional details / background info