Change the way of integrating RBAC API and Management API to a one Enforcer

[sagilio]

I think the best way to integrate IEnforcer (rbac api) and ManagementEnforcer (management api) to a one IEnforcer is use Extension Method to implement it. Here are some reasons:

1. IEnforcer can be a simple and clean interface.
2. We can maintain the RBAC and Management API at different class, and we can easy to add new helper type API.
3. Follow the CARP desgin.

It will become a break change, we should change the protect field to Read-only property (also GetModel method can do it) and delete the InternalEnforcer, ManagementEnforcer and CoreEnforcer and convert them to a Enforcer class which only includes the API in InternalEnforcer and CoreEnforcer in now version).

Relate comment:
#55 (comment)

[hsluoyz]

Why does it have breaking change?

[sagilio]

Why does it have breaking change?

Beacause the InternalEnforcer, ManagementEnforcer and CoreEnforcer class are public. If someone use them in the code, it will can not pass the compiling.

[huazhikui]

Agree with you, I think that the IManagementEnforcer don't need inherit ICoreEnforcer, it only need to include management api. through Extension Method integrate rbac api and management api. We can also add some decorator class to implement it.

[hsluoyz]

Good.