Select from yield-bearing round tokens

[spengrah]

Overview

For longer rounds, contributions can in theory be converted to a yield-bearing asset to grow the total funding per round. clrfund can use any ERC20 for the round token -- including deposit tokens like cTokens, aTokens, or yearn vault tokens -- so user contributions made in "raw" stablecoins could be converted into the yield-bearing round token, potentially via a zap.

On the deployer side, an option for admins to select the desired yield-bearing asset as the round token and configure the zap.

Considerations:

• deposit/withdrawal gas costs eating up any yield earned
• different defi protocols on different networks

[spengrah]

@daodesigner I don't think this is a priority. Maybe more relevant for Transparent, or perhaps even a subsequent iteration.