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/LINE.cpp

@@ -0,0 +1,72 @@
+#include "munga.h"
+#pragma hdrstop
+
+#include "line.h"
+#include "plane.h"
+
+//
+//###########################################################################
+//###########################################################################
+//
+Line&
+	Line::operator=(const Vector3D &vector)
+{
+	Check_Pointer(this);
+   Check(&vector);
+//
+// Make sure length of vector is non-zero
+//
+	length = vector.Length();
+	Verify(length);
+//
+// Normalize the vector and put it into the line
+//
+	direction.x = vector.x/length;
+	direction.y = vector.y/length;
+	direction.z = vector.z/length;
+	return *this;
+}
+
+//
+//###########################################################################
+//###########################################################################
+//
+Line&
+	Line::operator=(const Point3D &point)
+{
+	Check_Pointer(this);
+	Check(&point);
+//
+// Copy the point over into the line.
+//
+	origin.x = point.x;
+	origin.y = point.y;
+	origin.z = point.z;
+	return *this;
+}
+
+Scalar
+	Line::DistanceTo(
+		const Plane &plane,
+		Scalar *product
+	) const
+{
+	*product = direction * plane.normal;
+	if (Small_Enough(*product))
+	{
+		Check_Fpu();
+		return -1.0f;
+	}
+	Scalar result = -plane.DistanceTo(origin) / *product;
+	Check_Fpu();
+	return result;
+}
+
+Scalar
+	Line::DistanceTo(
+		const Sphere &,//sphere,
+		Scalar *//penetration
+	) const
+{
+	return -1.0f;  // HACK
+}