Kettle -> Gemini: RnD and Atmos revamp (#21866)

* Add files via upload

* Add gemini to map_attributions.txt

* Create gemini map proto

* Derotate Kettle, rotate Gemini

* Add Gemini to PostMapInitTest.cs

* Gemini locstrings

* Upload gemini map file

* Upload current master version of Kettle for historic record

* Continue testing Kettle as it is not removed entirely

* Fix Gemini prototype

* Christmas on Gemini station

Content.IntegrationTests/Tests/PostMapInitTest.cs

@@ -61,6 +61,7 @@ namespace Content.IntegrationTests.Tests
             "Core",
             "Marathon",
             "Kettle",
+            "Gemini",
             "MeteorArena",
             "Atlas"
         };