Adds the Odyssey gamemode. #28530

Job	Run time
Validate Structure	20s
Validate EditorConfig Compliance	3m 38s
Lint TGUI	42s
Lint OpenDream	33s
Lint Misc	1m 4s
Lint SpacemanDMM	21s
Create and Destroy Test (away_sites_testing, create_and_destroy)	10m 8s
Run Map Tests (exoplanet_testing, maptest)	2m 46s
Run Map Tests (runtime, maptest)	4m 29s
Run Map Tests (sccv_horizon, maptest)	11m 26s
Run Exoplanet Tests (exoplanet_testing, exoplanet_testing-2)	20m 18s
Run Exoplanet Tests (exoplanet_testing, exoplanet_testing-3)	19m 54s
Run Exoplanet Tests (exoplanet_testing, exoplanet_testing-1)	27m 5s
Generic Tests (away_sites_testing, generic)	9m 51s
Run Map Tests (away_sites_testing, awaysites-2)	27m 33s
Run Map Tests (away_sites_testing, awaysites-3)	26m 38s
Run Map Tests (away_sites_testing, awaysites-1)	16m 43s
Run Ruins Tests (runtime, ruins-1)	16m 27s
Run Ruins Tests (runtime, ruins-2)	14m 30s
Run Ruins Tests (runtime, ruins-3)	13m 34s
	3h 48m 0s

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