propogate player smart-pointer usage

src/files/WorldFiles.cpp

@@ -559,11 +559,11 @@ bool WorldFiles::readWorldInfo(World* world) {
 	return true;
 }
 
-void WorldFiles::writePlayer(Player* player) {
+void WorldFiles::writePlayer(std::shared_ptr<Player> player) {
 	files::write_json(getPlayerFile(), player->serialize().release());
 }
 
-bool WorldFiles::readPlayer(Player* player) {
+bool WorldFiles::readPlayer(std::shared_ptr<Player> player) {
 	fs::path file = getPlayerFile();
 	if (!fs::is_regular_file(file)) {
 		std::cerr << "warning: player.json does not exists" << std::endl;

src/files/WorldFiles.h

@@ -143,13 +143,13 @@ public:
 	chunk_inventories_map fetchInventories(int x, int z);
 
 	bool readWorldInfo(World* world);
-	bool readPlayer(Player* player);
+	bool readPlayer(std::shared_ptr<Player> player);
 
 	void writeRegion(int x, int y, 
 					 WorldRegion* entry, 
 					 fs::path file,
                      int layer);
-	void writePlayer(Player* player);
+	void writePlayer(std::shared_ptr<Player> player);
     /* @param world world info to save (nullable) */
 	void write(const World* world, const Content* content);
 	void writePacks(const World* world);