Method IsDirectoryExist

ImGuiFileDialog.cpp:479–485

        return bExists;  // this is not a directory!
    }
    bool IsDirectoryExist(const std::string& vName) override {
        if (!vName.empty()) {
            namespace fs = std::filesystem;
            return fs::is_directory(stringToPath(vName));
        }
        return false;  // this is not a directory!
    }
    bool IsFileExist(const std::string& vName) override {
        namespace fs = std::filesystem;
        return fs::is_regular_file(stringToPath(vName));