Add skin generation limit

Add a configuration option to limit the number of skins which will be
generated in one go.

Author: Murleen

BoSData/Input/Configuration/ConfigSetUserPref.json

@@ -35,6 +35,11 @@
       "value": 0,
       "label": "Generate skins",
       "help": "0 \u003d Skin generation disabled, 1 \u003d Generate skins for player flight only, 2 \u003d Generate skins for all planes"
+    },
+    "GenerateSkinsLimit": {
+      "value": 20,
+      "label": "Skin generation limit",
+      "help": "Maximum number of skins in one go, 0 for no limit"
     }
   }
 }

src/main/java/pwcg/core/config/ConfigItemKeys.java

@@ -10,6 +10,7 @@ public class ConfigItemKeys
 	public static final String MusicVolumeKey = "MusicVolume";
 	public static final String UseGenericUIKey = "UseGenericUI";
 	public static final String GenerateSkinsKey = "GenerateSkins";
+	public static final String GenerateSkinLimitKey = "GenerateSkinsLimit";
 
 	public static final String MovingFrontKey = "MovingFront";
     public static final String PilotInjuryKey = "PilotInjury";

src/main/java/pwcg/core/config/ConfigSetUserPref.java

@@ -14,6 +14,7 @@ public static ConfigSet initialize()
         configSet.addConfigItem(ConfigItemKeys.SoundVolumeKey, new ConfigItem("10"));
         configSet.addConfigItem(ConfigItemKeys.MusicVolumeKey, new ConfigItem("10"));
         configSet.addConfigItem(ConfigItemKeys.GenerateSkinsKey, new ConfigItem("0"));
+        configSet.addConfigItem(ConfigItemKeys.GenerateSkinLimitKey, new ConfigItem("20"));
 		return configSet;
 	}
 }

src/main/java/pwcg/mission/MissionSkinTemplateGenerator.java

@@ -19,6 +19,8 @@
 import pwcg.campaign.skin.SkinTemplate;
 import pwcg.campaign.skin.SkinsForPlane;
 import pwcg.campaign.skin.SkinTemplate.SkinTemplateInstance;
+import pwcg.core.config.ConfigItemKeys;
+import pwcg.core.config.ConfigManagerGlobal;
 import pwcg.core.exception.PWCGException;
 import pwcg.core.utils.Logger;
 import pwcg.mission.flight.Flight;
@@ -30,14 +32,15 @@ public class MissionSkinTemplateGenerator {
     public void generateSkins(Campaign campaign, List<Flight> flights) throws PWCGException
     {
         List<SkinTemplateInstance> skinsToGenerate = new ArrayList<>();
+        int generateSkinLimit = ConfigManagerGlobal.getInstance().getIntConfigParam(ConfigItemKeys.GenerateSkinLimitKey);
 
         for (Flight flight : flights)
         {
             for (PlaneMCU plane : flight.getPlanes())
             {
                 SkinsForPlane skinsForPlane = PWCGContextManager.getInstance().getSkinManager().getSkinsForPlane(plane.getType());
                 Skin skin = plane.getPlaneSkin();
-                if (skin != null && skin.getTemplate() != null)
+                if (skin != null && skin.getTemplate() != null && (generateSkinLimit == 0 || skinsToGenerate.size() < generateSkinLimit))
                 {
                     SkinTemplate template = skinsForPlane.getTemplate(plane.getPlaneSkin().getTemplate());
                     if (template == null)