Generate list of events about yearn-vaults

[fubuloubu]

Vault has:

• Vault.debtLimit() -> uint256: total debt limit of Vault (will lend more than this amount)
• Vault.totalDebt() -> uint256: total debt lent out by the Vault to strategies
• Vault.totalAssets() -> uint256: balance of want in Vault + debt owed by all strategies
• Vault.pricePerShare() -> uint256: amount of want for one full share (based on debt, not current positions)
• Vault.maxAvailableShares() -> uint256: number of shares that can be withdrawn, based on balance of want in Vault + sum of estimated value of all positions in all strategies in the withdrawal queue (the total withdrawable depth)
• Vault.emergencyShutdown() -> bool: whether Vault is in "emergency shutdown mode"
• Vault.withdrawalQueue() -> address[20]: the strategies that will be forcibly withdrawn from in the event a user wants to go that deep, based on the order provied

Vault has (for strategies):

• Vault.strategies(address _strategy) -> StrategyParams: all the stateful parameters of _strategy
• Vault.debtOutstanding(address _strategy) -> uint256: total debt Vault needs from _strategy
• Vault.creditAvailable(address _strategy) -> uint256: total credit Vault has availalble for _strategy
• Vault.expectedReturn(address _strategy) -> uint256: expected amount _strategy would return (since the last time it reported) if Vault.report were called at the calling block
• Vault.balanceSheetOfStrategy(address _strategy) -> uint256: estimated value of all positions of strategy in want (uncorrelated to debt)
• Vault.totalBalanceSheet(address[40] _strategies) -> uint256: loop through s in _strategies and call Vault.balanceSheetOfStrategy(s) + balance of want in Vault
• Vault.StrategyUpdate: event that occurs every time a strategy changes it's parameters with the Vault (addStrategy, Vault.updateStrategy, Vault.revokeStrategy, Vault.report)

[fubuloubu]

Reminder to think of events for BaseStrategy and also to add BaseStrategy API version.

• Harvested(returnGenerated, ...)

[fubuloubu]

I think this can be closed with the addition of the Registry?

[storming0x]

Agree this can be closed now that we have registry