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>

.gitignore

@@ -0,0 +1,48 @@
+# Visual Studio build artifacts
+[Dd]ebug/
+[Rr]elease/
+[Dd]ebug*/
+[Rr]elease*/
+x64/
+x86/
+[Bb]in/
+[Oo]bj/
+ipch/
+*.aps
+*.ncb
+*.opensdf
+*.sdf
+*.suo
+*.user
+*.cachefile
+*.vspscc
+*.vssscc
+*.pch
+*.ilk
+*.tlog
+*.lastbuildstate
+*.idb
+*.pdb
+*.obj
+*.o
+*.exe
+*.dll
+*.exp
+*.map
+
+# Visual Studio per-user / IDE state
+.vs/
+*.VC.db
+*.VC.opendb
+
+# Runtime / generated output
+*.log
+rpl4.log
+
+# Stale Subversion metadata
+.svn/
+
+# OS cruft
+Thumbs.db
+desktop.ini
+.DS_Store