Add AccessControlDefaultAdminRules #220
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Use AccessControlDefaultAdminRules inside the Authorization module
This contract implements the following risk mitigations on top of AccessControl:
Only one account holds the DEFAULT_ADMIN_ROLE since deployment until it’s potentially renounced.
Enforces a 2-step process to transfer the DEFAULT_ADMIN_ROLE to another account.
Enforces a configurable delay between the two steps, with the ability to cancel before the transfer is accepted.
The delay can be changed by scheduling, see changeDefaultAdminDelay.
It is not possible to use another role to manage the DEFAULT_ADMIN_ROLE.
see https://docs.openzeppelin.com
closes #192