working multithreading

finally managed to multithread folder scanner and rtp. it may still have some bugs. but it works

src/client_backend/scan.h

@@ -1,7 +1,18 @@
 #pragma once
 #include <string>
-void ListFilesRecursive(const std::string& directory,int thread_id);
-int scan_hash(const std::string& filename, const std::string& searchString);
-int scan_hash(const char* hash);
-int scan_hash(const char* hash);
-void action_scanfile(const char* filepath);
+#include <unordered_map>
+#include <Windows.h>
+#include <string>
+#include <fstream>
+#include <iostream>
+#include <cctype> // for std::isxdigit
+#include <iostream>
+#include <future>
+#include <vector>
+#include <algorithm>
+void scan_folder_recursive(const std::string& directory);
+void action_scanfile(const char* filepath);
+//void action_scanfile_t(const char* filepath);
+void action_scanfile_t(const std::string& filepath_);
+void initialize(const std::string& folderPath);
+void cleanup();