Port Gax From Estação Pirata (#1019)

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# Description

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This PR ports the "Gax" map directly from Estação Pirata, making some
changes and corrections.
This PR ports rbertoche/space-station-14#80
Gax is a recreated ss13 map, originally from YogStation (SS13)

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# TODO

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![Gax-0](https://github.com/user-attachments/assets/88e4daa5-0de1-4a68-b6ae-d957056a1b29)


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# Changelog

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:cl:
- add: A new map called NCS Gax has been added to rotation.

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Signed-off-by: Ichaie <[email protected]>
Co-authored-by: DEATHB4DEFEAT <[email protected]>
Co-authored-by: VMSolidus <[email protected]>

Author: 3 people

Content.IntegrationTests/Tests/PostMapInitTest.cs

@@ -61,7 +61,8 @@ public sealed class PostMapInitTest
             "TheHive", //DeltaV
             "Hammurabi", //DeltaV
             "Lighthouse", //DeltaV
-			"Submarine" //DeltaV
+            "Submarine", //DeltaV
+            "Gax"
         };
 
         /// <summary>