* Allow to liberate city to its founder.
* Workaround : Avoid exception on conquering city with infantry unit.
* Liberate button actually works.
* Fix trade resources check.
* Postpone the 2nd part of postBattleActions until choice is made.
* Add puppet option.
* Puppet city cannot be controlled directly.
* Add annex and puppet happiness/culture/science bonus.
* Add courthouse. Icon is missing.
* Icon for courthouse.
* Update png.
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