Replace IpToCountry with MaxMind database.

[Hackmastr]

Replace current country lookup IP with MaxMind's GeoLite2 database.

Description

Motivation and Context

Closes #609.

How Has This Been Tested?

Locally with PHP 7.3.1.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.