Demonstrate the possibility to reuse already deployed gatekeepers state & criteria

[0xjei]

This is something mentioned by @privacy-scaling-explorations/maci team as a feature which is missing in their gatekeeper design. However, the current design of Excubiae should make this possible (should, because it has not been tested yet).

This is strictly relevant for the following:

• Anyone should be able to create a new gatekeeper based on the state of an already deployed (and used) gatekeeper.
• Anyone should be able to create a new gatekeeper using the same constraint logic as an already deployed gatekeeper.

[ctrlc03]

• Anyone should be able to create a new gatekeeper based on the state of an already deployed (and used) gatekeeper.

how would this work with double-checks? or is this more of a: only pass second gatekeeper if you passed the first and you satisfy the second criteria too?

[0xjei]

• Anyone should be able to create a new gatekeeper based on the state of an already deployed (and used) gatekeeper.

how would this work with double-checks? or is this more of a: only pass second gatekeeper if you passed the first and you satisfy the second criteria too?

The following does not yet involve double checks (delayed to ms2), but for them you should potentially be able to satisfy expressions of checks (checkGateA && checkGateB || checkGateC). So if A, B or C is an already passed gatekeeper and you want to create a new gatekeeper based on it's state, you need to add a check (criteria) about it in your pass logic, like !gateA.alreadyPassed(address).