Collateral Token Mechanics

[apbendi]

• [x] Add a method to supply collateral token
  • [x] Pulls specified amount from sender
  • [x] Emits event with amount and sender
  • [x] Updates public property which tracks total collateral tokens
• [x] Updates to mature method
  • [x] Records the exchange rate between the collateral token and the treasury token using a generic Oracle interface
  • [x] Records the amount of collateral tokens which will be distributed during redemptions to make up for the treasury shortfall. This can be 0%, if the treasury has a surplus, or it could be 100%, if not even all the collateral tokens are enough to make up the shortfall.
  • [x] Records the “collateral redemption rate” based on the collateral tokens that will be distributed to make up for the shortfall.
• [x] Updates to the redeem method
  • [x] Transfers collateral tokens to the caller based on the “collateral redemption rate”