AccessControlContract implements IAccessControl.

EventOwnershipTransferred emit when the owner changed.

EventRoleAdminChanged emit when role's admin role changed.

EventRoleGranted emit when a account granted a role.

EventRoleRevoked emit when a account's role got revoked.

OwnableContract implements IOwnable which provides basic access control mechanism where there is an owner can be granted exclusive access to specific functions.

IAccessControl defines the interfaces which access control contract must implement.

IOwnable defines the interfaces which ownable contract must implement.