This diff allows to specify that an entity may only be created a limited time per match. E.g. once per match for a hero.
PossibleExtension:
- Allow to modify the limit during a match.
Part of: https://wildfiregames.com/forum/index.php?/topic/27214-borg-expansion-pack-mod-implementation-in-0ad-alpha-24-release/
Refs. https://wildfiregames.com/forum/topic/24682-champions-and-civilisations-balance-mod-for-a23/