Examples: Initial ImGui 1.85 integration example. (#338)

* Examples: Initial ImGui 1.85 integration example.

* Attempt to load and compile shaders.

* ImGUI integration done with some workarounds.

* ImGUI integration: Cleanup example.

* refactor tests->example_imgui

Co-authored-by: Turánszki János <turanszkij@users.noreply.github.com>

WickedEngine/wiHelper.cpp

@@ -672,6 +672,12 @@ namespace wiHelper
 		return path.string();
 	}
 
+	std::string GetCurrentPath()
+	{
+		auto path = std::filesystem::current_path();
+		return path.string();
+	}
+
 	void FileDialog(const FileDialogParams& params, std::function<void(std::string fileName)> onSuccess)
 	{
 #ifdef _WIN32