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/SPLINE.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include "affnmtrx.h"
+
+class CubicCurve
+{
+public:
+	#if defined(USE_SIGNATURE)
+		friend int Is_Signature_Bad(const volatile CubicCurve *);
+	#endif
+
+	CubicCurve(					// Hermite form
+		const Point3D& p1,
+		const Vector3D& r1,
+		const Point3D& p4,
+		const Vector3D& r4
+	);
+	CubicCurve(					// Bezier form
+		const Point3D& p1,
+		const Point3D& p2,
+		const Point3D& p3,
+		const Point3D& p4
+	);
+
+	void Evaluate(Scalar t, Point3D *p, Vector3D *v);
+
+	Logical TestInstance() const;
+
+protected:
+	AffineMatrix basisMatrix;
+};