* Remove Roles
* Add AccessControl and tests
* Removed IAccessControl
* Add RoleGranted and RoleRevoked events
* Make roles grantable and revokable regardless of their previous status
* Fix typo
* Add documentation
* Cleanup tests
* Add enumeration tests
* Add _setRoleAdmin tests
* Fix lint error
* Fix AccessControl link in docs
* WIP on access control guide
* Rename getRoleMembersCount
* Add tests for new role admin
* Make AccessControl GSN compatible
* Update access control guide
* Rename admin to adminRole
* Rename roleIds to roles
* Add 'operator' to RoleGranted and RoleRevoked events.
* Only emit events if the roles were not previously granted/revoked
* Uncomment expectEvent.not tests
* Rename operator to sender
* Add changelog entry
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