Add OpenPose_full renderer plugin for Maya

Maya API 2.0 plugin that maps a skeleton to OpenPose_full keypoints
(BODY_25 or COCO body, 21+21 hand, 70 face) via an openposeCharacter
node, with a live Viewport 2.0 draw override, an "OpenPose" viewport
renderer plus openposeRenderSequence for PNG output, and a PySide2
mapping editor. Face can also be driven procedurally from ARKit's 52
blendshape weights instead of facial joints, for rigs with no facial
skeleton. Includes VS Code debug configs and Maya test scenes/renders.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

scripts/start_debug_server.py

@@ -0,0 +1,28 @@
+"""Run this inside interactive Maya (Script Editor, Python tab) to enable
+the "Maya: Attach (debugpy)" launch config in .vscode/launch.json.
+
+One-time setup -- install debugpy into Maya's own Python environment
+(adjust the path for your Maya version):
+
+    "C:\\Program Files\\Autodesk\\Maya2024\\bin\\mayapy.exe" -m pip install debugpy
+
+Then, each Maya session, before attaching from VS Code:
+
+    exec(open(r"C:\\workspace\\PoseRenderer\\scripts\\start_debug_server.py").read())
+
+Breakpoints hit in plug-ins/ or python/openpose_renderer/ (e.g. inside
+draw_override.py's prepareForDraw, or a command's doIt) will then pause in
+VS Code once you run "Maya: Attach (debugpy)".
+"""
+
+import debugpy
+
+_ALREADY_LISTENING_ATTR = "_openpose_renderer_debugpy_listening"
+
+if not getattr(debugpy, _ALREADY_LISTENING_ATTR, False):
+    debugpy.listen(("localhost", 5678))
+    setattr(debugpy, _ALREADY_LISTENING_ATTR, True)
+    print("[openpose_renderer] debugpy listening on localhost:5678 -- "
+          "run 'Maya: Attach (debugpy)' in VS Code to connect.")
+else:
+    print("[openpose_renderer] debugpy already listening on localhost:5678.")