Drop unused activities from enum unit_activity
As I'd like to have arrays of length ACTIVITY_LAST, it's time to get rid of the unused values in that enum. With the preparations, especially concerning savegame compatibility, over the last couple of major versions should have made it possible.
As I'd like to have arrays of length ACTIVITY_LAST, it's time to get rid of the unused values in that enum. With the preparations, especially concerning savegame compatibility, over the last couple of major versions should have made it possible.