Paratroopers must be able to Conquer city to drop outside city
I did it this way to limit the number of enablers and to indicate that dropping to someones terrain during war is "aggressive" - someone may want to add Casus Belli rules or ban it via some peace wonder. I have no objection to changing it.
Seen in master classic ruleset. Given the other rules in effect in classic ruleset (all paratroopers do have CanOccupyCity) this isn't causing problems, but I think it's semantically wrong that
actionenabler_paradrop_base_to_war_conquer has actor requirement CanOccupyCity, while the target requirement is not about city center tile but about any Claimed tile.