Break web generator to own cmake.

src/core/file_utilities/Directory.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <vector>
+#include <filesystem>
+
+using Path = std::filesystem::path;
+
+class Directory
+{
+public:
+
+    static std::vector<Path> getFilesWithExtension(const Path& path, const std::string& extension);
+};