Update Antilles Center

[catchingstrays]

Description of changes

1. Antilles Center boundary is from the borders of Port-au-Prince (MTEG) to Santo Domingo (MDCS)
2. Antilles is shown as an FIR instead of a UIR.

Reason and motivation

MidCarib FIR (VATCAR) has a position "Antilles" which combines both sectors of Santo Domingo and Port-au-Prince for top-down coverage. It is not a Flight Service Station, just an added center facility with extended coverage.

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[github-actions]

Validate data: https://vatsim-radar.com/data/vatspy/1135/compare

For controllers data testing visit https://docs.vatsim-radar.com/contributing/debug.html

[github-actions]

Contributor data:

• CID: 1234306
• Name: Jacob Swan
• Region: VATCAR / MidCarib
• Role: VATCAR7 - Information Systems Manager, Air Traffic Manager
• Approving CID: N/A
• Approving staff: N/A

[Adrian2k]

AN** belongs to the country of Nauru, you can not add FIR's starting with another country's ICAO country code letters.
You will have to use an non excisting ICAO country code or use an ICAO code based on either of those two countries.

Note: Only the actual FIR entry needs to follow this, you can still alias ANT as a logon for the FIR, allowing you to use ANT_CTR.

[catchingstrays]

I've updated it to use the fictional ICAO "MDAT."