Use O(log(n)) search instead of O(n)

components/vfs/filesystemarchive.cpp

@@ -55,12 +55,7 @@ namespace VFS
 
     bool FileSystemArchive::contains(const std::string& file, char (*normalize_function)(char)) const
     {
-        for (const auto& it : mIndex)
+        return mIndex.find(file) != mIndex.end();
-        {
-            if(it.first == file)
-                return true;
-        }
-        return false;
     }
 
     std::string FileSystemArchive::getDescription() const