Story: Add economy

Created by: agraubert

I want the story system to use a virtual economy to start new stories.

• Use a !bid command to start a new story.
  • The minimum bid is 1+the current highest bid. Bids start at 1 token
  • If no user is currently playing a game, the bid immediately passes and starts a game
  • A game lasts 1 week, unless prematurely stopped by the user
  • Quitting a game before the first interactions will refund the bid -1 token
  • Quitting a game in progress yields tokens based on score
• Use a !reup command to extend the game time
  • A game lasts 1 week. 1 day prior to the end of that period, Beymax should PM a user if they wish to reup to keep playing
  • After the playtime expires, there is a 1 hour grace period for the player to reup (at an added cost) before a new game can be played
  • A reup extends the game time by another week
  • If the first week expires without any user interaction the grace period is skipped, and the game immediately ends and the current player is refunded bid-1 tokens
  • A game can only be reupped if it has had at least 1 interaction and there are less than 3 days of playtime remaining
  • A reup costs 1+(number of times the current session has been extended) and an additional 1 token if the game is in the 1 hour grace period
• Token payout
  • At the end of every week, each user is paid 10x their level in tokens
  • A user whose balance exceeds 100x their level is only paid 1x their level in tokens
  • Some number of tokens is paid when a user quits a game