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/ENTITYID.h

@@ -0,0 +1,61 @@
+#pragma once
+
+#include "network.h"
+
+//##########################################################################
+//##########################    EntityID    ################################
+//##########################################################################
+
+class EntityID
+{
+public:
+	#if defined(USE_SIGNATURE)
+		friend int Is_Signature_Bad(const volatile EntityID *);
+	#endif
+
+	typedef Enumeration LocalID;
+
+	EntityID();
+	EntityID(const EntityID&);
+	EntityID(HostID);
+	EntityID(HostID, LocalID);
+
+	Logical TestInstance() const;
+	HostID GetHostID()	{ return hostID; }
+
+	Logical operator!() const
+	{
+		Check(this);
+		return operator==(Null);
+	}
+	EntityID& operator=(const EntityID&);
+
+	EntityID operator-(const EntityID&) const;
+
+	EntityID& operator+=(const EntityID&);
+	EntityID& operator-=(const EntityID&);
+
+	EntityID& operator+=(LocalID);
+	EntityID& operator-=(LocalID);
+
+	Logical operator<(const EntityID&) const;
+	Logical operator<=(const EntityID&) const;
+	Logical operator>(const EntityID&) const;
+	Logical operator>=(const EntityID&) const;
+	Logical operator==(const EntityID&) const;
+	Logical operator!=(const EntityID&) const;
+
+	operator int() const;
+
+	static EntityID Null;
+	static LocalID LocalNull;
+
+	friend std::ostream& operator<<(std::ostream& stream, const EntityID& v)
+	{
+		return stream << v.hostID << ':' << v.localID;
+	}
+
+private:
+	HostID hostID;
+	LocalID localID;
+};