Add May not annex cities unique (#9314)

* Add `May not annex cities` unique, following same behaviour as Civ5 Venice. Hopefully this time I won't need to re-install windows.

* Add `May not annex cities` unique, following same behaviour as Civ5 Venice. Hopefully this time I won't need to re-install windows.

* Fix raze button being unavailable in city screen

* Fixed raze button being available in city screen, as per civ5

* Corrected indentation

* mayAnnex instead of canAnnex, hasUnique rather than getMatchingUniques

* AI will follow rules

* Replaced getMatchingUniques with hasUnique, for real this time

core/src/com/unciv/logic/automation/civilization/NextTurnAutomation.kt

@@ -1016,7 +1016,7 @@ object NextTurnAutomation {
                 ownMilitaryStrength < sumOfEnemiesMilitaryStrength * 0.66f
         for (city in civInfo.cities) {
             if (city.isPuppet && city.population.population > 9
-                    && !city.isInResistance()
+                    && !city.isInResistance() && !civInfo.hasUnique(UniqueType.MayNotAnnexCities)
             ) {
                 city.annexCity()
             }
@@ -1124,7 +1124,7 @@ object NextTurnAutomation {
         if ((city.population.population < 4 || civInfo.isCityState())
                 && city.foundingCiv != civInfo.civName && city.canBeDestroyed(justCaptured = true)) {
             // raze if attacker is a city state
-            city.annexCity()
+            if (!civInfo.hasUnique(UniqueType.MayNotAnnexCities)) { city.annexCity() }
             city.isBeingRazed = true
         }
     }

core/src/com/unciv/logic/battle/Battle.kt

@@ -595,6 +595,7 @@ object Battle {
         if (city.isOriginalCapital && city.foundingCiv == attackerCiv.civName) {
             // retaking old capital
             city.puppetCity(attackerCiv)
+            //Although in Civ5 Venice is unable to re-annex their capital, that seems a bit silly. No check for May not annex cities here.
             city.annexCity()
         } else if (attackerCiv.isHuman()) {
             // we're not taking our former capital

core/src/com/unciv/logic/city/managers/CityInfoConquestFunctions.kt

@@ -315,6 +315,13 @@ class CityInfoConquestFunctions(val city: City){
 
             if (civ.gameInfo.isReligionEnabled()) religion.removeUnknownPantheons()
 
+            if (newCiv.hasUnique(UniqueType.MayNotAnnexCities)) {
+                isPuppet = true
+                cityConstructions.currentConstructionIsUserSet = false
+                cityConstructions.constructionQueue.clear()
+                cityConstructions.chooseNextConstruction()
+            }
+
             tryUpdateRoadStatus()
             cityStats.update()