Objective flag system

core/src/mindustry/game/MapObjectives.java

@@ -172,9 +172,21 @@ public class MapObjectives{
 
     /** Base abstract class for any in-map objective. */
     public static abstract class MapObjective{
+        public String[] flagsAdded = {};
+        public String[] flagsRemoved = {};
         public ObjectiveMarker[] markers = {};
         public @Nullable String details;
 
+        public MapObjective withFlags(String... flags){
+            this.flagsAdded = flags;
+            return this;
+        }
+
+        public MapObjective withFlagsRemoved(String... flags){
+            this.flagsRemoved = flags;
+            return this;
+        }
+
         public MapObjective withMarkers(ObjectiveMarker... markers){
             this.markers = markers;
             return this;

core/src/mindustry/game/Rules.java

@@ -118,6 +118,8 @@ public class Rules{
     public ObjectSet<Item> hiddenBuildItems = Items.erekirOnlyItems.asSet();
     /** Campaign-only map objectives. */
     public Seq<MapObjective> objectives = new Seq<>();
+    /** Flags set by objectives. Used in world processors. */
+    public ObjectSet<String> objectiveFlags = new ObjectSet<>();
     /** HIGHLY UNSTABLE/EXPERIMENTAL. DO NOT USE THIS. */
     public boolean fog = false;
     /** If fog = true, this is whether static (black) fog is enabled. */