staging some future refactoring, .h -> hpp, fix for rendering w/ audio

src/util/working_directory.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <filesystem>
+
+namespace anm2ed::util
+{
+  class WorkingDirectory
+  {
+  public:
+    enum Type
+    {
+      FILE,
+      DIRECTORY
+    };
+
+    std::filesystem::path previous{};
+
+    WorkingDirectory(const std::filesystem::path&, Type type = DIRECTORY);
+    ~WorkingDirectory();
+  };
+}