[1858 Switzerland] Avoid modifying 1858's train definitions #11411
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Implementation Notes
Issue #11372 was caused by modifying 1858's train definitions without a making a deep copy. If a game of 1858 is loaded on the server after a game of 1858 Switzerland then it is was seeing the version of the definitions after these modifications, causing errors as 1858 does not have a method for handling the
blue_privates_available
event.Making a deep copy of the train definitions prevents this error.
This commit also makes a deep copy of the phase definitions. No problems have been observed with this, but making the copy is safer.
Fixes #11372.
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