Add cityAirUnitCapacity ModConstant (#13883)

* Add ModConstant to modify city air unit capacity

* Update docs: cityAirUnitCapacity ModConstant

core/src/com/unciv/logic/city/City.kt

@@ -272,11 +272,8 @@ class City : IsPartOfGameInfoSerialization, INamed {
 
     @Readonly fun getStrength() = cityConstructions.getBuiltBuildings().sumOf { it.cityStrength }.toFloat()
 
-    // This should probably be configurable
-    @Transient
-    private val maxAirUnits = 6
     /** Gets max air units that can remain in the city untransported */
-    @Readonly fun getMaxAirUnits() = maxAirUnits
+    @Readonly fun getMaxAirUnits() = civ.gameInfo.ruleset.modOptions.constants.cityAirUnitCapacity
 
     override fun toString() = name // for debug
 

core/src/com/unciv/models/ModConstants.kt

@@ -52,6 +52,9 @@ class ModConstants {
     var cityWorkRange = 3
     var cityExpandRange = 5
     
+    // Number of air units that can be stationed in a city
+    var cityAirUnitCapacity = 6
+
     // Modifies how much the gold value of a one-sided trade is applied to the gifts diplomatic modifier.
     // Eg: One side offers a city, resource or gold for nothing in return.
     var goldGiftMultiplier = 1f

docs/Modders/Mod-file-structure/5-Miscellaneous-JSON-files.md

@@ -211,6 +211,7 @@ and city distance in another. In case of conflicts, there is no guarantee which
 | baseCityBombardRange                     | Int    | 2                             | [^S]  |
 | cityWorkRange                            | Int    | 3                             | [^T]  |
 | cityExpandRange                          | Int    | 5                             | [^U]  |
+| cityAirUnitCapacity                      | Int    | 6                             | [^W]  |
 | unitSupplyPerPopulation                  | Float  | 0.5                           | [^C]  |
 | minimalCityDistance                      | Int    | 3                             | [^D]  |
 | minimalCityDistanceOnDifferentContinents | Int    | 2                             | [^D]  |
@@ -279,6 +280,7 @@ Legend:
 - [^T]: The multiplier of the gold value of a one-sided trade to be stored as gifts.
 - [^U]: The multiplier of the gold value of a regular trade to be stored as gifts. Set to 0 to disable gold gifting in two-sided trades.
 - [^U]: Modifies how quickly the GaveUsGifts dimplomacy modifier runs out. A higher value makes it run out quicker. Normally the gifts reduced by ~2.5% per turn depending on the diplomatic relations with the default value.
+- [^W]: Number of air units that can be stationed in a city, not including carried/transported air units.
 
 #### UnitUpgradeCost