Implement open-topped building support and fix building self-attack issue

[Metadorius]

• Fixed OpenTopped to work with buildings.
• Fixed buildings giving an order to attack self when unloading (manifested with opentopped buildings and garrisons leaving buildings sometimes).

TODO: need to move UpdateTypeData_Foot thing related to OpenTopped to generic UpdateTypeData

[github-actions[bot]]

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[TaranDahl]

There are many buildings using the occupant logic. It would be very troublesome to modify them one by one to OpenTopped. It would be best to have a global switch, such as ReplaceOccupiableAsOpenTopped, to batch replace it on LoadFromINI.