[0.H] Migrate railroad station OMTs and cancel said migration in railroads mod #77695
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Summary
None
Purpose of change
Railroad station OMTs weren't migrated
Describe the solution
Normal migration doesn't cut it bc the OMTs still exist in the railroads mod so I've added infra to overwrite and cancel migrations for mods
Describe alternatives you've considered
Marking the railroads mod as WIP in its name or just obsoleting it in 0.H bc it's not really intended to be used in a normal playthrough (it borks road gen heavily and you can't drive over level crossings)
Testing
Started an 0.G save with ramped up station spawns (just removed "UNIQUE"). Loaded said save in 0.H and got expected migration. Started an 0.H save with the railroads mod and ramped up station spawns, saved and loaded it a few times with expected results.
Additional context