unify savegame version and bump to 27 #36654
Merged
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Summary
SUMMARY: none
Purpose of change
This unifies all of the different savegame versions that are saved via overmap and such into one savegame_loading_version, which makes it a lot easier to update the savegame version when new rules are needed for migration reasons.
Testing
the first half of #36576 and tested as part of that.
Additional context
I wish i had known about the different savegame versions before christmas when i did the first bump, but oh well.