Initial import of Red Planet v4.10 Win32 source

Imports the current Win32 source for the pod-racing game 'Red Planet',
built on the MUNGA engine and its L4 (Win32/DirectX) platform layer:

- MUNGA / MUNGA_L4: cross-platform engine core and Win32 backend
- RP / RP_L4: Red Planet game logic and Win32 application
- DivLoader, Setup1: asset loader and installer project
- lib, MUNGA_L4/openal, MUNGA_L4/sos: third-party audio dependencies

Removed stale Subversion metadata and added .gitignore/.gitattributes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

MUNGA/NODE.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "socket.h"
+
+class Node : public Plug
+{
+public:
+	~Node();
+
+	virtual int ReceiveNodeCommand(NodeCommandID, void *)	{ return 0; }
+
+	virtual void ReleaseLinkHandler(Socket *, Plug *);
+
+protected:
+	Node(ClassID class_id = TrivialNodeClassID);
+	Node(PlugStream *stream);
+};