Adds the Odyssey gamemode. #28527

Job	Run time
Validate Structure	14s
Validate EditorConfig Compliance	3m 11s
Lint OpenDream	31s
Lint SpacemanDMM	22s
Lint Misc	59s
Lint TGUI	43s
Run Map Tests (exoplanet_testing, maptest)	1m 39s
Generic Tests (away_sites_testing, generic)	1m 37s
Create and Destroy Test (away_sites_testing, create_and_destroy)	1m 38s
Run Map Tests (runtime, maptest)	1m 34s
Run Map Tests (sccv_horizon, maptest)	1m 39s
Run Exoplanet Tests (exoplanet_testing, exoplanet_testing-2)	1m 38s
Run Map Tests (away_sites_testing, awaysites-2)	1m 38s
Run Map Tests (away_sites_testing, awaysites-3)	1m 39s
Run Map Tests (away_sites_testing, awaysites-1)	1m 40s
Run Exoplanet Tests (exoplanet_testing, exoplanet_testing-3)	1m 39s
Run Exoplanet Tests (exoplanet_testing, exoplanet_testing-1)	1m 39s
Run Ruins Tests (runtime, ruins-1)	1m 33s
Run Ruins Tests (runtime, ruins-2)	1m 38s
Run Ruins Tests (runtime, ruins-3)	1m 38s
	28m 49s

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