S3_0 civ2civ3: UnitClassFlag "Barracks"
Port Barracks effects refactoring from #47636 to S3_0. Just don't give the "Barracks" flag to "Small Land" units on that branch, to avoid functional change.
Reduced number of effects to check should be good for server performance.
S3_0 has only 8 user unit class flag slots. Sandbox is using almost all of them (this patch was still possible, though)
Port Barracks effects refactoring from #47636 to S3_0. Just don't give the "Barracks" flag to "Small Land" units on that branch, to avoid functional change.
Reduced number of effects to check should be good for server performance.