Dance around early support (#897)

## Link to GitHub Issue or related Pull Request, if one exists
N/A

## Description of change
This PR add initial supports for running Dance aRound in window mode,
with keyboard, cardio supports.

## Testing
- Tested game play under Windows 10 using Kinect V1 with my visionpose
compatible layer (https://github.com/Avimitin/dance-around-anygear)


https://github.com/user-attachments/assets/4b821dcf-751d-4953-b626-4a9491569183

- Tested full game play, user profile saving with Asphyxia

Assisted by AI.

---------

Co-authored-by: Codex <codex@openai.com>

src/spice2x/CMakeLists.txt

@@ -554,6 +554,9 @@ set(SOURCE_FILES ${SOURCE_FILES}
         games/pc/pc.cpp
         games/pc/io.cpp
         games/pc/bi2x_hook.cpp
+        games/udn/udn.cpp
+        games/udn/io.cpp
+        games/udn/bi2x_hook.cpp
 
         # hooks
         hooks/audio/acm.cpp
@@ -605,6 +608,7 @@ set(SOURCE_FILES ${SOURCE_FILES}
         hooks/graphics/backends/d3d9/d3d9_texture.cpp
         hooks/graphics/backends/d3d11/d3d11_backend.cpp
         hooks/graphics/backends/d3d11/d3d11_swapchain.cpp
+        hooks/graphics/backends/d3d11/d3d11_swapchain_udn.cpp
         hooks/graphics/backends/d3d11/d3d11_factory.cpp
         hooks/graphics/backends/d3d11/d3d11_vtable_capture.cpp
         hooks/graphics/backends/d3d11/d3d11_screenshot.cpp