Add comparison function for OverworldItem class

- Introduced CompareOverworldItems function to compare two vectors of OverworldItem objects for equality based on their properties (x, y, id).
- Included necessary header for algorithm functions to support the new comparison logic.

src/app/zelda3/overworld/overworld_item.h

@@ -1,6 +1,7 @@
 #ifndef YAZE_APP_ZELDA3_OVERWORLD_ITEM_H_
 #define YAZE_APP_ZELDA3_OVERWORLD_ITEM_H_
 
+#include <algorithm>
 #include <cstdint>
 #include <iomanip>
 #include <iostream>
@@ -65,6 +66,25 @@ class OverworldItem : public GameEntity {
   bool deleted = false;
 };
 
+inline bool CompareOverworldItems(const std::vector<OverworldItem>& items1,
+                                  const std::vector<OverworldItem>& items2) {
+  if (items1.size() != items2.size()) {
+    return false;
+  }
+
+  const auto is_same_item = [](const OverworldItem& a, const OverworldItem& b) {
+    return a.x_ == b.x_ && a.y_ == b.y_ && a.id_ == b.id_;
+  };
+
+  return std::all_of(items1.begin(), items1.end(),
+                     [&](const OverworldItem& it) {
+                       return std::any_of(items2.begin(), items2.end(),
+                                          [&](const OverworldItem& other) {
+                                            return is_same_item(it, other);
+                                          });
+                     });
+}
+
 const std::vector<std::string> kSecretItemNames = {
     "Nothing",        // 0
     "Green Rupee",    // 1