os-OPNWAF geoip under access control

[mic-dev-84]

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Is your feature request related to a problem? Please describe.
We would like to block certain countries to access certain webapplications behind the waf. Or only allow certain countries to access an application.

Describe the solution you'd like
Beeing able to use Aliases objects under the Locations>Access control setting would be the right place.

Describe alternatives you've considered
I don't think there is another way of doing this than inside the waf. Using different public ip addresses would defy the purpose of the waf.
And most applications don't have geoip functions we could use based on x-forwarded-for headers

Additional context
none