InterestManager is to invest Dai into an interest-generating protocol. Currently this is implemented as InterestManagerCompound which invests into Compound.invest: Invests Dai to generate interestuint amount: The amount of Dai to investreturns: The amount of cDai receivedredeem: Redeems Daiaddress recipient: The address to receive the redeemed Daiuint amount: The amount of Dai to redeemreturns: The amount of burned cDairedeemInvestmentToken: Redeems Dai, but with the amount parameter being the amount of cDai to convert instead of the amount of Dai to redeem.accrueInterest: Calls the underlying protocol to update the accrued interest which in this case is cDai.accrueInterest()withdrawComp: Transfers COMP tokens to the compRecipient