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>

DPLSTUB.h

@@ -0,0 +1,40 @@
+#pragma once
+
+enum dpl_TYPE
+{
+	dpl_type_error,
+	dpl_type_scene,
+	dpl_type_zones,
+	dpl_type_view,
+	dpl_type_instance,
+	dpl_type_dcs,
+	dpl_type_light,
+	dpl_type_object,
+	dpl_type_lod,
+	dpl_type_geogroup,
+	dpl_type_geometry,
+	dpl_type_material,
+	dpl_type_texture,
+	dpl_type_texmap,
+	dpl_type_ramp	
+};
+
+class dpl_OBJECT {};
+class dpl_DCS {};
+class dpl_ZONE {};
+class dpl_PARTICLESTART_EFFECT_INFO {};
+class dpl_VIEW {};
+class dpl_INSTANCE {};
+class dpl_GEOGROUP {};
+class dpl_GEOMETRY {};
+class dpl_LIGHT {};
+class dpl_LIGHT_TYPE {};
+class dpl_LOAD_MODE {};
+class dpl_ISECT_MODE {};
+class dpl_TEXTURE {};
+class dpl_MATERIAL {};
+class dpl_TEXMAP {};
+class dpl_EXPLOSION_EFFECT_INFO {};
+class dpl2d_DISPLAY {};
+class dpl2d_MATRIX {};
+