Country registration check

xF2 Add-on Country registration check 1.9

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The table andy_county_registration_check table is now being pruned by cron entry. The Country registration check page will now show every occurrence of rejected countries.
Added error handling code if ipstack.com returns invalid json.
Added additional code to prevent null condition server error logs.
Fixed issue where ipstack.com is over limit and variable was returned as null.
Added 'Allowed country codes' to options page.
Added table to prevent repeated ipstack.com lookups.
Added Country registration check page to see which IPs have been blocked.