Handle Compound events

[danhper]

Handle comptroller market creation, interest rate model update, collateral factor update

Supported events

• [x] Borrow
• [x] LiquidateBorrow
• [x] MarketEntered
• [x] MarketExited
• [x] MarketListed
• [x] Mint
• [x] NewCloseFactor
• [x] NewCollateralFactor
• [x] NewComptroller
• [x] NewMarketInterestRateModel
• [x] NewReserveFactor
• [x] Redeem
• [x] RepayBorrow
• [x] ReservesAdded
• [x] ReservesReduced
• [x] Transfer

Unneeded events

• ActionPaused: this disables features such as Mint or Borrow. Events will not be emitted if Mint or so has been disabled so we do not need to explicitly handle this event.
• Failure: used to register an error, does not have a direct impact on balances
• Approval: as long as no transfer is executed, we do not need to know about who approves what
• NewAdmin: does not affect any balance
• NewImplementation: not important which contract is emitting the events
• NewPauseGuardian: does not affect any balance
• NewPendingAdmin: does not affect any balance
• NewPendingImplementation: not important which contract is emitting the events
• NewPriceOracle: price oracle will be implemented slightly differently anyway
• NewMaxAssets: typical yagni

Other events

• COMP related: #6
• NewLiquidationIncentive: #7
• AccrueInterest: #4