Enable script in big world (#884)

* add docs for tower

* fix: LEAK: ByteBuf.release() was not called

* enableScriptInBigWorld

* not print log when loaded scripts from cache

* revert the change of server tick

* revert the change of server tick

* fix

* optimize the performance: lazy load & cache

* fix the refresh group

* fix NPE

Co-authored-by: Melledy <52122272+Melledy@users.noreply.github.com>

src/main/java/emu/grasscutter/scripts/SceneIndexManager.java

@@ -0,0 +1,41 @@
+package emu.grasscutter.scripts;
+
+import ch.ethz.globis.phtree.PhTree;
+import emu.grasscutter.utils.Position;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Function;
+
+public class SceneIndexManager {
+
+    public static <T> void buildIndex(PhTree<T> tree, List<T> elements, Function<T, long[]> extractor){
+        elements.forEach(e -> tree.put(extractor.apply(e), e));
+    }
+    public static <T> List<T> queryNeighbors(PhTree<T> tree, Position position, int range){
+        var result = new ArrayList<T>();
+        var arrPos = position.toLongArray();
+        var query = tree.query(calRange(arrPos, -range), calRange(arrPos, range));
+        while(query.hasNext()){
+            var element = query.next();
+            result.add(element);
+        }
+        return result;
+    }
+    public static <T> List<T> queryNeighbors(PhTree<T> tree, long[] position, int range){
+        var result = new ArrayList<T>();
+        var query = tree.query(calRange(position, -range), calRange(position, range));
+        while(query.hasNext()){
+            var element = query.next();
+            result.add(element);
+        }
+        return result;
+    }
+    private static long[] calRange(long[] position, int range){
+        var newPos = position.clone();
+        for(int i=0;i<position.length;i++){
+            newPos[i] += range;
+        }
+        return newPos;
+    }
+}