Add Time-Bound Authorization settings

[felix2feng]

• Authorized addresses of the vault, SetTokenFactory, TransferProxy, and TakerWalletWrapper can only be set for a month.
• Unit testing includes use of increaseTimeAsync and snapshot reversions to handle time-based tests

[coveralls]

Pull Request Test Coverage Report for Build 1375

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 1332:	0.0%
Covered Lines:	345
Relevant Lines:	345

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💛 - Coveralls

[asoong]

How does it calculate 4 weeks? Is it automatically 28 days?

[asoong]

I dont think SetTokenFactory needs Authorizable, going to change to just be Core's address

[felix2feng]

It might be more explicit to note do the number of seconds vs. using a higher level construct like weeks.

OK - will remove from SetTokenFactory

[felix2feng]

@asoong I wonder if it makes sense to pass the Core address in the constructor. Do we imagine needing to change Core's address?