Fix viewableChunks memory leaks

src/NPCManager.cpp

@@ -84,6 +84,7 @@ void NPCManager::destroyNPC(int32_t id) {
         Eggs.erase(id);
 
     // finally, remove it from the map and free it
+    delete entity->viewableChunks;
     NPCs.erase(id);
     delete entity;
 }

src/PlayerManager.cpp

@@ -81,6 +81,7 @@ void PlayerManager::removePlayer(CNSocket* key) {
 
     std::cout << getPlayerName(key->plr) << " has left!" << std::endl;
 
+    delete plr->viewableChunks;
     key->plr = nullptr;
     delete plr;
     players.erase(key);