Country and Carrier lookup data errors

[KMnOFour]

Describe the bug
Two problems.

Issue 1

Several carriers have no country assigned. After researching, the issue is that two sources were used for the airport and country datasets, and there were discrepancies in the naming conventions used for several countries. The airport dataset tends to use the informal standard naming convention where the country dataset uses the formal one, but in other cases either dataset might refer to an old name rather than the current one. Examples:

Airport country name	Country country name
South Korea	Korea, Republic of
Congo (Brazzaville)	Congo, Republic of
Burma	Myanmar

These values need to match for the airport lookup tables to be build with the correct ISO3 codes from the Country table or some Airports won't have a country code.

Issue 2

Several country codes are incorrect or missing. Countries comprising the former Netherlands Antilles (1954 to 2010) need to be added and updated to reflect their new statuses. The flags were previously corrected in another PR.

To test:

1. All carriers in the lookup editor should have a country code assigned (sort by country to see nulls)
2. The following country codes in code editor > Country should exist: CUW, BES, SXM